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• OCZ Vertex 2 not recognized by Ubuntu installer

  - by Zsub

  As I boot into the Ubuntu 10.10 (or 11.04, doesn't matter) live environment or installer, it just refuses to recognise my Vertex 2. It reports the disk as ATA and not supporting smart, shows no serial number, and doesn't list the size correctly. All fdisk tells me is Unable to read /dev/sda (it's the only storage in the PC). I'm now running a temporary install of Windows 7 off of it, which worked like a charm, so where am I going wrong with Ubuntu... Specs: Asus M4N68T-M LE V2 (BIOS 0702, most recent) OCZ Vertex 2 SSD 60 GB Amd Athlon II X4 640 Patriot PSD34G13332 4GB DDR3 ram (two banks) EDIT I installed a second drive, installed Ubuntu on that and booted, it recognised the SSD just fine. I'm now trying to apt-get upgrade the live-environment. I wonder if there is any way to sort of install Ubuntu from Ubuntu (I boot into the working install on the other drive, install it on the SSD and then boot from the SSD). EDIT2 Ok, so that doesn't work. The install detects the SSD, however, it cannot format it. EDIT3 After a fresh boot I can read out SMART-data and even perform a read-benchmark, but if I try to format it, or do a write-bench, it'll crap out and after that it says SMART is not supported. So basically it seems I can't write to the disk, as it will stop working when I do, I will try to run repeated read-benchmarks to see if that has any effect. EDIT4 I'm running several read benchmarks on the drive right now, they give results that are to be expected from an SSD. If the read-benches don't fail, I can use fdisk on the disk, but it is now stuck trying to re-read the partition table after issueing the 'w' command. EDIT5 Parted Magic did recognize the drive and with hdparm -I even could tell me the drive was in a frozen state. I powercycled it (just pull out the plug from the SSD and plug it back in) and it wasn't frozen anymore. After that I could upgrade the firmware on the drive (still using Parted Magic) and format it to Ext4. After I rebooted into the Ubuntu installer, it wouldn't get recognized and hdparm didn't want to talk to it saying HDIO_DRIVE_CMD(identify) failed: Invalid exchange. EDIT6 For some reason if I enable one of the RAID controllers (the one the SSD is connected to, obviously) Ubuntu will let me format it, mount it and write to it. The installer also recognizes it. However if the raid controller is enabled but no array is defined the motherboard can't boot from it :(

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• radvd is not assigning prefix

  - by Samik

  I'm currently trying to setup IPv6 address auto-configuration with router advertisement daemon (radvd) on a virtual machine running CentOS 6.5. But the eth0 interface is not obtaining that prefix. I've obtained the ULA prefix from here. Contents of /etc/sysctl.conf # Kernel sysctl configuration file for Red Hat Linux # # For binary values, 0 is disabled, 1 is enabled. See sysctl(8) and # sysctl.conf(5) for more details. # Controls IP packet forwarding net.ipv4.ip_forward = 0 net.ipv6.conf.all.forwarding = 1 # Controls source route verification net.ipv4.conf.default.rp_filter = 1 # Do not accept source routing net.ipv4.conf.default.accept_source_route = 0 # Controls the System Request debugging functionality of the kernel kernel.sysrq = 0 # Controls whether core dumps will append the PID to the core filename. # Useful for debugging multi-threaded applications. kernel.core_uses_pid = 1 # Controls the use of TCP syncookies net.ipv4.tcp_syncookies = 1 # Disable netfilter on bridges. net.bridge.bridge-nf-call-ip6tables = 0 net.bridge.bridge-nf-call-iptables = 0 net.bridge.bridge-nf-call-arptables = 0 # Controls the default maxmimum size of a mesage queue kernel.msgmnb = 65536 # Controls the maximum size of a message, in bytes kernel.msgmax = 65536 # Controls the maximum shared segment size, in bytes kernel.shmmax = 68719476736 # Controls the maximum number of shared memory segments, in pages kernel.shmall = 4294967296 Contents of /etc/radvd.conf # NOTE: there is no such thing as a working "by-default" configuration file. # At least the prefix needs to be specified. Please consult the radvd.conf(5) # man page and/or /usr/share/doc/radvd-*/radvd.conf.example for help. # # interface eth0 { AdvSendAdvert on; MinRtrAdvInterval 3; MaxRtrAdvInterval 10; AdvDefaultPreference low; AdvHomeAgentFlag off; prefix fd8a:8d9d:808f:1::/64 { AdvOnLink on; AdvAutonomous on; AdvRouterAddr on; }; }; Contents of /etc/sysconfig/network-scripts/ifcfg-eth0 DEVICE=eth0 HWADDR=52:54:00:74:d7:46 TYPE=Ethernet UUID=af5db1cb-e809-4098-be1a-5a74dbb767b1 ONBOOT=yes NM_CONTROLLED=no BOOTPROTO=dhcp IPV6INIT=yes IPV6_AUTOCONF=yes I've also enabled radvd at startup through chkconfig. Though I noticed that radvd is starting after interfaces are brought up. I've tried restarting the network service afterwards but still I get the following link-local address only #ip -6 addr show 1: lo: mtu 16436 inet6 ::1/128 scope host valid_lft forever preferred_lft forever 2: eth0: mtu 1500 qlen 1000 inet6 fe80::5054:ff:fe74:d746/64 scope link valid_lft forever preferred_lft forever Edit: Based on the answer given by Sander Steffann I still need clarification on some points but I'm posting here what worked. Contents of /etc/sysconfig/network NETWORKING=yes HOSTNAME=syslog-ng-server NETWORKING_IPV6=yes IPV6FORWARDING=yes Contents of /etc/sysconfig/network-scripts/ifcfg-eth0 DEVICE=eth0 HWADDR=52:54:00:74:d7:46 TYPE=Ethernet UUID=af5db1cb-e809-4098-be1a-5a74dbb767b1 ONBOOT=yes NM_CONTROLLED=no BOOTPROTO=dhcp IPV6INIT=yes IPV6_AUTOCONF=yes IPV6FORWARDING=no Removed following line from /etc/sysctl.conf net.ipv6.conf.all.forwarding = 1 Contents of /etc/radvd.conf is as previous.

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• Windows Server 2008 - one MAC Address, assign multiple external IP's to VirtualBoxes running as guests on host

  - by Sise

  Couldn't find any help @ google or here. The scenario: Windows Server 2008 Std x64 on i7-975, 12 GB RAM. The server is running in a data centre. One hardware NIC - RealTek PCIe GBE - one MAC Address. The data centre provides us 4 static external IP's. The first is assigned to the host by default of course. I have ordered all 4 IP's, the data centre can assign the available IP's to the physical MAC address of the given NIC only. This means one NIC, one MAC Address, 4 IP's. Everything works fine so far. Now, what I would like to have: Installed VirtualBox with 1-3 guests running, each gets it's own external IP assigned. Each of it should be an standalone Win Server 2008. It looks like the easiest way would be to put the guests into an virtual subnet and routing all data coming to the 2nd till 4th external IP through to this guests using there subnet IP's. I have been through the VirtualBox User Manuel regarding networking. What's not working: I can't use bridged networking without anything else, because the IP's are assigned to the one MAC address only. I can't use NAT networking because it does not allow access from outside or the host to the guest. I do not wanna use port forwarding. Host-only networking itself would not allow internet access, by sharing the default internet connection of the host, internet is granted from the guest to the outside but not from outside or the host to the guest. InternalNetworking is not really an option here. What I have tried is to create an additional MS Loopback adapter for a routed subnet, where the Vbox guests are in, now the idea was to NAT the internet connection to the loopback 'subnet'. But I can't ping the gateway from the guests. By using route command in the command shell or RRAS (static route, NAT) I didn't get there as well. Solutions like the following do work for the one way, but not for the way back: For your situation, it might be best to use the Host-Only adapter for ICS. Go to the preferences of VB itself and select network. There you can change the configuration for the interface. Set the IP address to 192.168.0.1, netmask 255.255.255.0. Disable the DHCP server if it isn't already and that's it. Now the Guest should get an IP from Windows itself and be able to get onto the internet, while you can also access the Host. Slowly I'm pretty stucked with this topic. There is a possibility I've just overlooked something or just didn't getting it by trying, especially using RRAS, but it's kinda hard to find useful howto's or something in the web. Thanks in advance! Best regards, Simon

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• Django + gunicorn + virtualenv + Supervisord issue

  - by Florian Le Goff

  Dear all, I have a strange issue with my virtualenv + gunicorn setup, only when gunicorn is launched via supervisord. I do realize that it may very well be an issue with my supervisord and I would appreciate any feedback on a better place to ask for help... In a nutshell : when I run gunicorn from my user shell, inside my virtualenv, everything is working flawlessly. I'm able to access all the views of my Django project. When gunicorn is launched by supervisord at the system startup, everything is OK. But, if I have to kill the gunicorn_django processes, or if I perform a supervisord restart, once that gunicorn_django has relaunched, every request is answered with a weird Traceback : (...) File "/home/hc/prod/venv/lib/python2.6/site-packages/Django-1.2.5-py2.6.egg/django/db/__init__.py", line 77, in connection = connections[DEFAULT_DB_ALIAS] File "/home/hc/prod/venv/lib/python2.6/site-packages/Django-1.2.5-py2.6.egg/django/db/utils.py", line 92, in __getitem__ backend = load_backend(db['ENGINE']) File "/home/hc/prod/venv/lib/python2.6/site-packages/Django-1.2.5-py2.6.egg/django/db/utils.py", line 50, in load_backend raise ImproperlyConfigured(error_msg) TemplateSyntaxError: Caught ImproperlyConfigured while rendering: 'django.db.backends.postgresql_psycopg2' isn't an available database backend. Try using django.db.backends.XXX, where XXX is one of: 'dummy', 'mysql', 'oracle', 'postgresql', 'postgresql_psycopg2', 'sqlite3' Error was: cannot import name utils Full stack available here : http://pastebin.com/BJ5tNQ2N I'm running... Ubuntu/maverick (up-to-date) Python = 2.6.6 virtualenv = 1.5.1 gunicorn = 0.12.0 Django = 1.2.5 psycopg2 = '2.4-beta2 (dt dec pq3 ext)' gunicorn configuration : backlog = 2048 bind = "127.0.0.1:8000" pidfile = "/tmp/gunicorn-hc.pid" daemon = True debug = True workers = 3 logfile = "/home/hc/prod/log/gunicorn.log" loglevel = "info" supervisord configuration : [program:gunicorn] directory=/home/hc/prod/hc command=/home/hc/prod/venv/bin/gunicorn_django -c /home/hc/prod/hc/gunicorn.conf.py user=hc umask=022 autostart=True autorestart=True redirect_stderr=True Any advice ? I've been stuck on this one for quite a while. It seems like some weird memory limit, as I'm not enforcing anything special : $ ulimit -a core file size (blocks, -c) 0 data seg size (kbytes, -d) unlimited scheduling priority (-e) 20 file size (blocks, -f) unlimited pending signals (-i) 16382 max locked memory (kbytes, -l) 64 max memory size (kbytes, -m) unlimited open files (-n) 1024 pipe size (512 bytes, -p) 8 POSIX message queues (bytes, -q) 819200 real-time priority (-r) 0 stack size (kbytes, -s) 8192 cpu time (seconds, -t) unlimited max user processes (-u) unlimited virtual memory (kbytes, -v) unlimited file locks (-x) unlimited Thank you.

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• Why do I need to set up Autologon values in registry twice in before it works and can I fix this?

  - by jJack

  Background: As part an automated testing suite I am building, I need to set up Autologon on my virtual machines 'on demand'. By on demand, I mean that I don't want to necessarily pre-configure my VM or any snapshot to have Autologon set up already, for security reasons and also a huge business case. My solution so far: I'm copying a script to the guest machine and then using Sysinternals PsExec to execute it. The script is: reg add "hklm\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon" /f /v DefaultUserName /t REG_SZ /d myusername reg add "hklm\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon" /f /v DefaultPassword /t REG_SZ /d myfakepassword reg add "hklm\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon" /f /v DefaultDomainName /t REG_SZ /d mydomain reg add "hklm\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon" /f /v ForceAutoLogon /t REG_SZ /d 1 reg add "hklm\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon" /f /v AutoAdminLogon /t REG_SZ /d 1 reg add "hklm\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\AutoLogonChecked" /f /ve /d 1 Note: I don't believe AutoLogonChecked is required for machines post Windows 2000 but I'm doing it just in case for now. Maybe ForceAutoLogon isn't either, not sure yet. The Problem: I see PsExec executes this properly and all the values are in the registry, however when I restart the machine, the user isn't automatically logged on...When I run this a second time then restart the machine, the user is finally logged on. A diff between the registry states shows that the first time I run this, it is missing both the "1" for AutoAdminLogon, and also the DefaultPassword key. The second time I execute it, these values are correctly intact as I intended. So, what is going on here? Is this expected? This post claims in the end that it really all just works (the problem was that a logoff script was setting off the values). Doesn't seem to work for me however. Note this seems unique to Windows 7, does not occur in Windows XP Also note that you don't need PsExec to recreate the issue - just modify the registry yourself EDIT/update: Login interactively and run script (so, not executing it remotely), logging off automatically logs me back in (so, it works) remotely execute the script in guest when I'm interactively logged in, logging off automatically logs me back in (so, it works) remotely execute the script in guest when with non-interactive session if I log in afterwards (so, interactive now) then back off, it logs me back in (so, it then works) EDIT/update 2: This only occurs for Win7x86, Win7x64, Win8x64. This does not occur for Windows XP

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• Windows Vista: Networking can only connect "local only"

  - by Damien

  I am attempting to debug a problem on a Windows Vista laptop - not mine! Until just recently (last week or so), it was operating normally for about 4 years :) The problem is that I am having issues connecting to the local network (a basic wireless home router; more later) and the internet (via ADSL). This is both for wired [Broadcom chipset] and wireless [Intel chipset]. I will elaborate further later. To detail the network. I have three other clients (HTC phone, Ubuntu 12.04 desktop [wired] and Ubuntu 10.04 laptop [wireless]), all of whom are able to connect to the network and internet normally. A windows 7 virtual machine running on said desktop connects normally. I have tried two different wireless routers - Netgear DG834G and Netgear DGN3500. The same error mode is common to both. Updating the firmware to the latest on both routers does not help. Overall, it seems safe to say it's localised to the laptop in question. I do not have another Vista client to test with. The specific symptoms are as follows: When "connected", it says "Local Only", and says it cannot connect to the internet. This is true for both wired and wireless. It can get an IP address (192.168.0.5), and the router (192.168.0.1) reports that it can see the device. When I try to ping, I get the following results: ping 192.168.0.1 - (router) all packets lost ping 192.168.0.5 - (laptop's address) OK ping 192.168.0.4 - (desktop) all packets lost Pinging from the desktop to the problematic laptop results in "From 192.168.0.4 icmp_seq=1 Destination Host Unreachable" The most promising "fix" from trawling forums is KB928233 which does not work for me. The problem is persistent across reports (both full shutdown and hibernate) so it appears not to be sleep related. I am not a regular vista user, though I can fumble my way about a bit. Is there any other suggestions as to what I should do? Is there any further information I can provide?

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• How can I connect DLNA devices through NAT?

  - by Bob

  I have a Windows 7 PC running Serviio as a DLNA server. I have a Samsung I9100G running Skifta as a DLNA renderer (client). My network topology: At the moment, I can connect and watch my videos fine if the phone is on router #2. The server is on a wired network with #2. Router #1 is 192.168.1.1, router #2 is 192.168.2.1 (192.168.1.2) and router #3 is 192.168.3.1 (192.168.1.3). In other words, each router has its own subnet, using NAT - their "modem" port is connected with a "LAN" port on the modem/router 1. What I want to do is be able to connect to the DLNA server if the renderer is connected to router #1/#3 - #1 is on the WAN side of #2, while #3 is even further separated. I'll settle for just #1 working, though. Normally, I would just forward the appropriate ports, and everything would work fine. However, (apparently) DLNA uses UPnP, which I am unfamiliar with. I tried enabling UPnP on router #2, but that did not seem not change anything. It's a Belkin F5D7230-4 6000 - there's reported issues with UPnP on F5D7230-4 7000. UPnP is already enabled on router #1 - a Billion BiPAC 7700N. I've also tried the built in DLNA renderer/server/controller on my phone, Samsung AllShare. It can see the server on router #2 and browse files, but has issues playing or downloading them. It also can't see the server on the other two networks. I'm currently using Skifta/s "local" mode. "Remote" mode requires an account, which I don't really want to create if not necessary. Is it possible too do what I'm trying to do? If no, are there workarounds? If yes, how do I do it? Is my server the issue? The renderer (client)? The router(s)? My method? I can change just about anything except the routers.

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• Netdom to restore machine secret

  - by icelava

  I have a number of virtual machines that have not been switched on for over a month, and some others which have been rolled back to an older state. They are members of a domain, and have expired their machine secrets; thus unable to authenticate with the domain any longer. Event Type: Warning Event Source: LSASRV Event Category: SPNEGO (Negotiator) Event ID: 40960 Date: 14/05/2009 Time: 10:24:54 AM User: N/A Computer: TFS2008WDATA Description: The Security System detected an authentication error for the server ldap/iceland.icelava.home. The failure code from authentication protocol Kerberos was "The attempted logon is invalid. This is either due to a bad username or authentication information. (0xc000006d)". For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp. Data: 0000: c000006d Event Type: Warning Event Source: LSASRV Event Category: SPNEGO (Negotiator) Event ID: 40960 Date: 14/05/2009 Time: 10:24:54 AM User: N/A Computer: TFS2008WDATA Description: The Security System detected an authentication error for the server cifs/iceland.icelava.home. The failure code from authentication protocol Kerberos was "The attempted logon is invalid. This is either due to a bad username or authentication information. (0xc000006d)". For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp. Data: 0000: c000006d Event Type: Error Event Source: NETLOGON Event Category: None Event ID: 3210 Date: 14/05/2009 Time: 10:24:54 AM User: N/A Computer: TFS2008WDATA Description: This computer could not authenticate with \\iceland.icelava.home, a Windows domain controller for domain ICELAVA, and therefore this computer might deny logon requests. This inability to authenticate might be caused by another computer on the same network using the same name or the password for this computer account is not recognized. If this message appears again, contact your system administrator. For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp. Data: 0000: c0000022 So I try to use netdom to re-register the machine back to the domain C:\Documents and Settings\Administrator>netdom reset tfs2008wdata /domain:icelava /UserO:enterpriseadmin /PasswordO:mypassword Logon Failure: The target account name is incorrect. The command failed to complete successfully. But have not been successful. I wonder what else needs to be done?

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• Windows 7 remains powered on when restarting

  - by BombDefused

  I'm running windows 7 x64 on an MSI P67A-GD53 motherboard, in an Antec P280 Super Midi Towercase with a Corsair 650w PSU. I've just installed a second instance of windows 7 x64 on a separate disk (this is to keep my games separate from my work OS). The problem is that it appears now that I cannot restart from either instance of Windows 7. The shut down command, and sleep commands work as expected. When I try to restart, the shutdown happens but the system never reboots. Everything remains powered on, until I hold down the power button to force the power off. Ithink (but am not 100% sure) this has only started since I installed the second OS, and am assuming this has something to do with the motherboard needing to know which OS to run up again? Some other forums I've read suggest that the PSU has a major role in restart and could be at fault. Changing the boot order of the disks in the BIOS does not change anything. Any suggestions greatfully recieved! Update: I now have a reproduceable issue: I think the secondary OS install may have been a red herring. It was when windows tried to reboot during the install that I noticed the issue. After playing around with installing drivers, and rebooting many many times, I have found that it is the OC genie setting on the MSI motherboard that seems to trigger the problem. This makes sense as I only started using the OC genie feature a couple of weeks ago, and probably hadn't used restart in that time. However... simply turning off OC genie does not make the issue go away. I have to turn off OC genie, shutdown, start enter bios, go to the "Save and Exit" menu "Restore Defaults" yes to "Load optimized defaults", which will reset to clear the problem. Now when the PC boots into windows, I can restart as normal (and from the OS on either HDD). I only know how to control the issue, and don't still know the root cause. I'd like to be able to use the OC genie function if anyone can suggest a why I'm seeing this problem. Could it be that I'm drawing too much power when using OC feature?

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• backup of KVM VM's running on Ubuntu 12.4.1 precise edition from a remote machine

  - by Dr. Death

  I am creating a library API which will take the backup of all the VM's running on KVM hypervisor. My VM's can be of any type. I am taking this backup from a remote machine and need to put the backup at remote server. I have KVM, Libvirt installed on my system. Some of my VM's are LVM based and some are normal VM's running on KVM. I research and found out an excellent perl script for taking the backup http://pof.eslack.org/2010/12/23/best-solution-to-fully-backup-kvm-virtual-machines/ but since I am developing this library in C++ I cannot use it however it has given me a good understanding of how it will work. One thing I didnot able to sort out is if my VM's are not created using virt-manager or are created using any other tool them virsh system list command does not give them in the list of running VM's however they are running perfectly on my KVM server. Is there a way to list these VM's in my system list anyhow? secondly, when I am taking backup from the remote machine I am getting out of my ssh mode as soon as my libvirt command finishes and for every command I need to ssh again, Is there a way that I do not need to ssh each and every time? I have already used the rsa key for ssh but when once my command finishes my control moves to the remote machine again and try to find out my source VM location in remote machine's local drives which in turn fails it. here is the main problem I am facing. also for the LVM based VM I am able to take the live backup but for non LVM based my machines are getting suspended and not been able to take the live backup. Since my library will work on the remote machine only I might not know the VM's configruation on the KVM server. so need to make it consistent for all the VM's. Please share any thing related to this issue so that I may be able to take the live backup of the non lvm vm's also. I'll update my working and any research findings time to time to all of you. Thanks in advance for your suggestions in these regards.

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• why can't I open a port on Win 7? is it the app's fault?

  - by rjnagle

  I am having problems opening a port from one Windows PC on my local network. On Windows 7 computer ("Computer A") I running Calibre, an ebook management program that has something called an "ebook content server" . In essence, it serves via the web a content catalog. From Computer A, I can access the content server on localhost. ie. http://127.0.0.1:8787 calls up the content server successfully. With ipconfig I have confirmed that its local IP address is 192.168.1.106 From Computer B (a Vista Machine) I can ping 192.168.1.106 I have tried opening/editing a port in the Windows Firewall several times. In Windows firewall -- Allowed Programs in Control Panel, I see a listing for Calibre (with both Home/Work and PUblic checked) In details, I see Name: Calibre, Port Number 8787, Protocol TCP If I use the Advanced Security configuration screen for the firewall, I created an Inbound Rule on Computer A for Calibre (with the settings I indicated). If I run this command line on Computer A, I see: netstat -a -n TCP 0.0.0.0:554 0.0.0.0:0 LISTENING TCP 0.0.0.0:664 0.0.0.0:0 LISTENING TCP 0.0.0.0:2869 0.0.0.0:0 LISTENING TCP 0.0.0.0:3306 0.0.0.0:0 LISTENING TCP 0.0.0.0:5357 0.0.0.0:0 LISTENING TCP 0.0.0.0:6570 0.0.0.0:0 LISTENING TCP 0.0.0.0:6580 0.0.0.0:0 LISTENING TCP 0.0.0.0:8787 0.0.0.0:0 LISTENING TCP 0.0.0.0:10243 0.0.0.0:0 LISTENING TCP 192.168.1.106:63020 74.125.227.51:80 TIME_WAIT TCP [::]:80 [::]:0 LISTENING TCP [::]:135 [::]:0 LISTENING TCP [::]:443 [::]:0 LISTENING TCP [::]:445 [::]:0 LISTENING TCP [::]:554 [::]:0 LISTENING TCP [::]:2869 [::]:0 LISTENING TCP [::]:5357 [::]:0 LISTENING TCP [::]:6570 [::]:0 LISTENING TCP [::]:6580 [::]:0 LISTENING TCP [::]:10243 [::]:0 LISTENING TCP [::]:49152 [::]:0 LISTENING TCP [::]:49153 [::]:0 LISTENING TCP [::]:49154 [::]:0 LISTENING TCP [::]:49155 [::]:0 LISTENING TCP [::]:49170 [::]:0 LISTENING And lots of other junk, but this seems relevant, I see port 80 is open (I run xampp apache web server for windows on Machine A) This is the only time I see port 8787 referenced from the netstat commmand. From Windows Computer B, I can, ping 192.168.1.106 and even view http://drupal.local (on Computer A) and http://192.168.1.106/ (which goes to the Xampp config screen on Computer A). But I cannot access via Computer B htttp://192.168.1.106:8787 or htttp://computerhosta:8787 So what is going wrong? Is this a problem with the Calibre application or have I incorrectly opened the port? What things could possibly interfere with the opening of this port? On a sidenote, I have tried using telnet from Computer B to see if port 80 or 8787 is open for 192.168.1.106. I get no reply for either one. Thanks.

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• Why do Ping and Dig provide different IP address than nslookup?

  - by user1032531

  When pinging my domain name which points to my home public IP from two different servers on my LAN, it shows them pinging different IP. Further investigation shows dig and nslookup providing different results. See below. A little history. My IP used to be 11.22.33.444 and is hosted by Comcast. I changed routers, and it somehow got changed to 55.66.77.888. I've since updated my 1and1 domain name to point to the 55.66.77.888. desktop is a basic server, runs the web server, and connects wirelessly to my LAN. laptop is a GUI and connected via CAT5. Both operate Centos6.4. My old router was a D-Link, and used their "Virtual Server" feature to pass port 80 to desktop. My new router is a Linksys, and I use their "Port Forwarding" feature to pass port 80 to desktop (however, I haven't gotten this part working yet). What is going on??? Why the different IPs? Obviously, it most somehow be stored on the server, but why does the actual machine even know the public IP since it is on a LAN? How do I purge the old IP? [root@desktop etc]# dig +short myDomain.com 11.22.33.444 [root@desktop etc]# nslookup www.myDomain.com Server: 8.8.8.8 Address: 8.8.8.8#53 Non-authoritative answer: Name: www.myDomain.com Address: 55.66.77.888 [root@desktop etc]# dig myDomain.com ; <<>> DiG 9.8.2rc1-RedHat-9.8.2-0.17.rc1.el6_4.6 <<>> myDomain.com ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 13822 ;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0 ;; QUESTION SECTION: ;myDomain.com. IN A ;; ANSWER SECTION: myDomain.com. 16031 IN A 11.22.33.444 ;; Query time: 21 msec ;; SERVER: 8.8.8.8#53(8.8.8.8) ;; WHEN: Mon Oct 21 04:36:52 2013 ;; MSG SIZE rcvd: 44 [root@desktop etc]# [root@laptop ~]# dig +short myDomain.com 55.66.77.888 [root@laptop ~]# nslookup www.myDomain.com Server: 192.168.0.1 Address: 192.168.0.1#53 Non-authoritative answer: Name: www.myDomain.com Address: 55.66.77.888 [root@laptop ~]#

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• ubuntu mail server settings and /etc/hosts file

  - by mbrc

  This is my /etc/hosts file 127.0.0.1 localhost.localdomain localhost 127.0.1.1 ubuntu-server.xx.com ubuntu-server 193.77.xx.xx mail.xx.com mail # The following lines are desirable for IPv6 capable hosts ::1 ip6-localhost ip6-loopback fe00::0 ip6-localnet ff00::0 ip6-mcastprefix ff02::1 ip6-allnodes ff02::2 ip6-allrouters is this correct configuration for my mail server. I am behind router so i don't know if is ok to use my IP for mail.xx.com and 127.0.0.1 for localhost problem is that i can receive mail but when i send it i get Oct 17 21:29:32 ubuntu-server postfix/smtpd[2453]: warning: SASL authentication failure: Password verification failed Oct 17 21:29:32 ubuntu-server postfix/smtpd[2453]: warning: my.router[192.168.1.1]: SASL PLAIN authentication failed: authentication failure Oct 17 21:29:34 ubuntu-server postfix/smtpd[2453]: warning: my.router[192.168.1.1]: SASL LOGIN authentication failed: authentication failure EDIT: mabye is problem some port. i foward this ports. POP3 - port 110 IMAP - port 143 SMTP - port 25 HTTP - port 80 Secure SMTP (SSMTP) - port 465 Secure IMAP (IMAP4-SSL) - port 585 StartTLS - port 587 IMAP4 over SSL (IMAPS) - port 993 Secure POP3 (SSL-POP) - port 995 postconf -n alias_database = hash:/etc/aliases alias_maps = hash:/etc/aliases append_dot_mydomain = no biff = no broken_sasl_auth_clients = yes config_directory = /etc/postfix content_filter = amavis:[127.0.0.1]:10024 delay_warning_time = 4h disable_vrfy_command = yes inet_interfaces = all inet_protocols = all mailbox_size_limit = 0 maximal_backoff_time = 8000s maximal_queue_lifetime = 7d message_size_limit = 0 minimal_backoff_time = 1000s mydestination = myhostname = mail.xx.com mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128 mynetworks_style = host myorigin = /etc/mailname readme_directory = no receive_override_options = no_address_mappings recipient_delimiter = + relayhost = smtp_helo_timeout = 60s smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache smtp_use_tls = yes smtpd_banner = $myhostname ESMTP $mail_name smtpd_client_restrictions = reject_rbl_client sbl.spamhaus.org, reject_rbl_client blackholes.easynet.nl, reject_rbl_client dnsbl.njabl.org smtpd_data_restrictions = reject_unauth_pipelining smtpd_delay_reject = yes smtpd_hard_error_limit = 12 smtpd_helo_required = yes smtpd_helo_restrictions = permit_mynetworks, warn_if_reject reject_non_fqdn_hostname, reject_invalid_hostname, permit smtpd_recipient_limit = 16 smtpd_recipient_restrictions = reject_unauth_pipelining, permit_mynetworks, permit_sasl_authenticated, reject_non_fqdn_recipient, reject_unknown_recipient_domain, reject_unauth_destination, permit smtpd_sasl_auth_enable = yes smtpd_sasl_local_domain = smtpd_sasl_security_options = noanonymous smtpd_sender_restrictions = permit_sasl_authenticated, permit_mynetworks, warn_if_reject reject_non_fqdn_sender, reject_unknown_sender_domain, reject_unauth_pipelining, permit smtpd_soft_error_limit = 3 smtpd_tls_cert_file = /etc/ssl/private/mail.xx.com.crt smtpd_tls_key_file = /etc/ssl/private/mail.xx.com.key smtpd_tls_session_cache_database = btree:${data_directory}/smtpd_scache smtpd_use_tls = yes unknown_local_recipient_reject_code = 450 virtual_alias_maps = mysql:/etc/postfix/maps/alias.cf virtual_gid_maps = static:5000 virtual_mailbox_base = /var/spool/mail/virtual virtual_mailbox_domains = mysql:/etc/postfix/maps/domain.cf virtual_mailbox_limit = 0 virtual_mailbox_maps = mysql:/etc/postfix/maps/user.cf virtual_uid_maps = static:5000 saslfinger -c version: 1.0.4ostfix Cyrus sasl configuration Ä mode: client-side SMTP AUTH -- basics -- Postfix: 2.9.3 System: Ubuntu 12.04.1 LTS \n \l -- smtp is linked to -- libsasl2.so.2 => /usr/lib/i386-linux-gnu/libsasl2.so.2 (0x00d3a000) -- active SMTP AUTH and TLS parameters for smtp -- relayhost = smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache smtp_use_tls = yes -- listing of /usr/lib/sasl2 -- total 28 drwxr-xr-x 2 root root 4096 okt 14 15:18 . drwxr-xr-x 72 root root 12288 okt 14 15:03 .. -rw-r--r-- 1 root root 1 maj 4 06:17 berkeley_db.txt -rw-r----- 1 root root 701 okt 14 15:18 saslpasswd.conf -rw-r----- 1 smmta smmsp 885 okt 14 15:18 Sendmail.conf -- listing of /etc/postfix/sasl -- total 12 drwxr-xr-x 2 root root 4096 okt 11 18:55 . drwxr-xr-x 4 root root 4096 okt 12 06:59 .. -rwx------ 1 root root 241 okt 11 18:55 smtpd.conf Cannot find the smtp_sasl_password_maps parameter in main.cf. Client-side SMTP AUTH cannot work without this parameter!

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• my multi boot can't boot to XP 'resumeobject' is missing

  - by GwenKillerby

  In my multi boot set up, booting to vista and 7 goes fine, but when I try to boot to XP, i get an error Windows failed to start. A recent hardware or software change might be the cause. To fix the problem: 1. Insert your Windows installation disc and restart your computer. 2. Choose your language settings, and then click "Next." 3. Click "Repair your computer." If you do not have this disc, contact your system administrator or computer manufacturer for assistance. File: \NTLDR Status: 0xc000000e Info: The selected entry could not be loaded because the application is missing or corrupt. See below. Clearly the resumeobject seems to be missing in the XP entry ("Real Mode Boot sector"), only I don't know how to restore it. Vista is on **C:**, Win7 is on **F:** (as is the bootmgr ??? ) and WinXP is on **E:** What I've tried: [1] I've used about 5 windows discs, that is the Recovery Consoles from real XP install CD's and 3 virtual Recovery Consoles. All failed. The real CD's work ONE time, but won't let me finish, I only got as far as [b]fixboot E:[/b] Then they shut the laptop down, I kid you not. On a next startup, all 5 CD's ask me for some Admin password that I've never added! [2] I have VisualBCD and EasyBCD, but the most obvious things I tried there didn't solve the problem. So know I don't exactly know what to do with them. [3] I CAN boot into XP with the FIX NTLDR workaround of http://milescomer.com/tinyempire.com/notes/ntldrismissing.htm, but it doesn't fix it permanently QUESTION: How do I fix it permanently? bcdedit /enum output: Windows Boot Manager -------------------- identifier {bootmgr} device partition=F: path \bootmgr description Windows Boot Manager locale en-US default {current} displayorder {current} {812e27a9-27b7-11e4-8fb4-dfa8174ae8dc} {812e27ac-27b7-11e4-8fb4-dfa8174ae8dc} timeout 30 resume No Windows Boot Loader ------------------- identifier {current} device partition=C: path \Windows\system32\winload.exe description Vista locale nl-NL osdevice partition=C: systemroot \Windows resumeobject {73d8b5bc-2764-11e4-b181-806e6f6e6963} Windows Boot Loader ------------------- identifier {812e27a9-27b7-11e4-8fb4-dfa8174ae8dc} device partition=F: path \Windows\system32\winload.exe description Daisy Etta locale en-US osdevice partition=F: systemroot \Windows resumeobject {b8c234a4-27b0-11e4-b8b3-806e6f6e6963} Real-mode Boot Sector --------------------- identifier {812e27ac-27b7-11e4-8fb4-dfa8174ae8dc} device partition=E: path \NTLDR description XP Thank you.

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• Windows 7 playback of dvr-Microsoft files stutters

  - by Jim Lynn

  I've just had to install Windows 7 on my Media Center machine because my Vista installation had a faulty drive. I've got the latest drivers that I can find - Intel 945GM integrated Graphics, Realtek audio drivers. Things are working OK with one exception. Playback of old recordings, from dvr-Microsoft format files, is choppy. The picture freezes for a fraction of a second, then quickly catches up. The sound is uninterrupted and doesn't pause. These freezes happen once every 5 seconds or so. It's very regular. Playback of Live TV from the digital tuner is perfectly smooth. DVD playback is perfectly smooth. As an experiment, I used the MPEG editing package VideoReDo to create a small test file in three different formats. This program takes the raw MPEG streams and repackages them into the desired container. I took the same clip and created three files in three formats: dvr-Microsoft (Microsoft's old recorded TV format); mpg (standard MPEG); and ts (raw MPEG transport stream of the kind often produced by PVRs). When these three files are played back under Windows 7, the mpg and ts files play smoothly, but the dvr-Microsoft file stutters. The last piece of data I have is that two other Windows 7 machines can play back dvr-Microsoft files smoothly with no stuttering. One is a netbook, with less grunt than the media centre. So there must be something specific about my Media Center machine that's causing the problem. Does anyone have any idea where I can look now? I don't know much about AV software, codecs, filter graphs etc. but I suspect that's where the problem lies. Rendering the video isn't the problem, but extracting the streams is. How would I go about diagnosing the problem? Edited to add: I just used the GraphStudio tool to look at the filter graph on the offending PC. The filter graph it uses by default for dvr-Microsoft looks identical to the other machines, and, interestingly, when I play the files using GraphStudio they run smoothly. Under Windows Media Player and Windows Media Center they stutter. I'd like to see the filter graph for Windows Media Player but GraphStudio won't show it. It looks like Windows Media Player and WMC are using a different decoding path to GraphStudio. Edited again to add: Today I purchased a new HDTV. The same Media Center driving the TV at 1080p is now playing back the old Recorded TV files smoothly, without stuttering. So whatever the cause of the original problem, using a different resolution seems to have removed the problem. It might also explain why nobody else has had this problem. I doubt many people use Media Centre with a 14in portable TV.

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• .htaccess working on remote server but does not work on localhost. Getting 404 errors on localhost

  - by Afsheen Khosravian

  MY PROBLEM: When I visit localhost the site does not work. It shows some text from the site but it seems the server can not locate any other files. Here is a snippet of the errors from firebug: "NetworkError: 404 Not Found - localhost/css/popup.css" "NetworkError: 404 Not Found - localhost/css/style.css" "NetworkError: 404 Not Found - localhost/css/player.css" "NetworkError: 404 Not Found - localhost/css/ui-lightness/jquery-ui-1.8.11.custom.css" "NetworkError: 404 Not Found - localhost/js/jquery.js" It seems my server is looking for the files in the wrong places. For example, localhost/css/popup.css is actually located at localhost/app/webroot/css/popup.css. I have my site setup on a remote server with the same exact configurations and it works perfectly fine. I am just having this issue trying to run the site on my laptop at localhost. I edited my VirtualHosts file DocumentRoot and to /home/user/public_html/site.com/public/app/webroot/ and this reduces some errors but I feel that this is wrong and sort of hacking it since I didn't use these setting on my production server which works. The last note I want to make is that the website uses dynamic URLs. I dont know if that has anything to do with it. For example, on the production server the URLS are: site.com/#hello/12321. HERES WHAT I AM WORKING WITH: I have a LAMP server setup on my laptop which runs on Ubuntu 11.10. I have enabled mod_rewrite: sudo a2enmod rewrite Then I edited my Virtual Hosts file: <VirtualHost *:80> ServerName localhost DirectoryIndex index.php DocumentRoot /home/user/public_html/site.com/public <Directory /home/user/public_html/site.com/public/> Options Indexes FollowSymLinks MultiViews AllowOverride All Order allow,deny allow from all </Directory> </VirtualHost> Then I restarted apache. My website is using cakePHP. This is the directory structure of the website: "/home/user/public_html/site.com/public" contains: index.php app cake plugins vendors These are my .htaccess files: /home/user/public_html/site.com/public/app/.htaccess: <IfModule mod_rewrite.c> RewriteEngine on RewriteRule ^$ webroot/ [L] RewriteRule (.*) webroot/$1 [L] </IfModule> /home/user/public_html/site.com/public/app/webroot/.htaccess: <IfModule mod_rewrite.c> RewriteEngine On RewriteCond %{REQUEST_FILENAME} !-d RewriteCond %{REQUEST_FILENAME} !-f RewriteRule ^(.*)$ index.php?url=$1 [QSA,L] </IfModule>

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• Why is my cron daemon is being killed every few minutes? OpenVZ?

  - by user113215

  As of about a week ago, my cron daemon refuses to stay running. I'm using Debian 6. Running something like pgrep cron shows that the daemon isn't running. I start the service with service cron start or /etc/init.d/cron start and it launches, but it disappears from the running process list after a few minutes (varying anywhere between 1 - 30 minutes before the process is killed again). Using strace -f service cron start, I can see that the process is being killed for some reason: nanosleep({56, 0}, 0x7fffa7184c80) = 0 stat("crontabs", {st_mode=S_IFDIR|S_ISVTX|0730, st_size=4096, ...}) = 0 stat("/etc/crontab", {st_mode=S_IFREG|0644, st_size=1100, ...}) = 0 stat("/etc/cron.d", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0 stat("/etc/cron.d/php5", {st_mode=S_IFREG|0644, st_size=475, ...}) = 0 stat("/etc/cron.d/anacron", {st_mode=S_IFREG|0644, st_size=244, ...}) = 0 rt_sigprocmask(SIG_BLOCK, [CHLD], [], 8) = 0 rt_sigaction(SIGCHLD, NULL, {0x4036f0, [CHLD], SA_RESTORER|SA_RESTART, 0x2b0e8465f230}, 8) = 0 rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0 nanosleep({60, 0}, <unfinished ...> +++ killed by SIGKILL +++ There's nothing relevant in /var/log/syslog, /var/log/messages, /var/log/auth.log, or /var/log/kern.log to explain why the the process is dying. The system has about 500 MB of free memory, and cat /proc/loadavg returns 0.10 0.21 0.45 so resources shouldn't be the issue. I also tried removing and reinstalling the cron package using apt-get. What else should I check? How do I find out what's killing my crond? Edit: I'm on a virtual machine under OpenVZ (and as such, I have no swap). With cron running, free -m reports: total used free shared buffers cached Mem: 1024 465 558 0 0 0 -/+ buffers/cache: 465 558 Swap: 0 0 0 My OpenVZ User Beancounters via cat /proc/user_beancounters: Version: 2.5 uid resource held maxheld barrier limit failcnt 172087: kmemsize 8275718 25561636 51200000 51200000 0 lockedpages 0 968 2048 2048 0 privvmpages 113442 266465 262200 262200 3740757 shmpages 788 4004 128000 128000 0 dummy 0 0 0 0 0 numproc 39 98 600 600 0 physpages 50521 208434 0 9223372036854775807 0 vmguarpages 0 0 512000 512000 0 oomguarpages 50521 208447 512000 512000 0 numtcpsock 7 323 4096 4096 0 numflock 7 64 2048 2048 0 numpty 1 4 32 32 0 numsiginfo 0 23 1024 1024 0 tcpsndbuf 137984 17878480 20480000 20480000 0 tcprcvbuf 114688 6983504 20480000 20480000 0 othersockbuf 162960 1074440 20480000 20480000 0 dgramrcvbuf 0 24208 10240000 10240000 0 numothersock 101 353 2048 2048 0 dcachesize 459171 747444 10240000 10240000 0 numfile 1010 4221 50000 50000 0 dummy 0 0 0 0 0 dummy 0 0 0 0 0 dummy 0 0 0 0 0 numiptent 39 424 2048 2048 0

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• SQL server 2008 R2 installation error

  - by Sonia

  I have a windows 7,32 bit laptop. I am the administrator with all permissions. when I click on the SQL server 2008R2 set up file,it says : "SQL server set up has encountered the following error:Failed to retreive data for this request" click on OK. I have uninstalled all the components of SQL from control panel. I used Windows installer clean up to remove the files(which I must have not done ),but still no go. The summary.txt log says: Overall summary: Final result: Failed: see details below Exit code (Decimal): 847168662 Exit facility code: 638 Exit error code: 50326 Exit message: Failed to retrieve data for this request. Start time: 2012-05-25 14:59:15 End time: 2012-05-25 15:00:09 Requested action: RunRules Log with failure: C:\Program Files\Microsoft SQL Server\100\Setup Bootstrap\Log\20120525_145905\Detail.txt Exception help link: http%3a%2f%2fgo.microsoft.com%2ffwlink%3fLinkId%3d20476%26ProdName%3dMicrosoft%2bSQL%2bServer%26EvtSrc%3dsetup.rll%26EvtID%3d50000%26ProdVer%3d10.0.5500.0%26EvtType%3d0xEF814B06%400x92D13C14 Machine Properties: Machine name: EWAN-PC Machine processor count: 4 OS version: Windows Vista OS service pack: Service Pack 1 OS region: Australia OS language: English (United States) OS architecture: x86 Process architecture: 32 Bit OS clustered: No Package properties: Description: SQL Server Database Services 2008 SQLProductFamilyCode: {628F8F38-600E-493D-9946-F4178F20A8A9} ProductName: SQL2008 Type: RTM Version: 10 SPLevel: 0 Installation location: c:\385030d65c6ff61fb9\x86\setup\ Installation edition: EXPRESS User Input Settings: ACTION: RunRules CONFIGURATIONFILE: FEATURES: HELP: False INDICATEPROGRESS: False INSTANCENAME: QUIET: False QUIETSIMPLE: False RULES: GLOBALRULES,SqlUnsupportedProductBlocker,PerfMonCounterNotCorruptedCheck,Bids2005InstalledCheck,BlockInstallSxS,AclPermissionsFacet,FacetDomainControllerCheck,SSMS_IsInternetConnected,FacetWOW64PlatformCheck,FacetPowerShellCheck X86: False Configuration file: C:\Program Files\Microsoft SQL Server\100\Setup Bootstrap\Log\20120525_145905\ConfigurationFile.ini Detailed results: Rules with failures: Global rules: There are no scenario-specific rules. Rules report file: The rule result report file is not available. Exception summary: The following is an exception stack listing the exceptions in outermost to innermost order Inner exceptions are being indented Exception type: Microsoft.SqlServer.Management.Sdk.Sfc.EnumeratorException Message: Failed to retrieve data for this request. Data: HelpLink.ProdName = Microsoft SQL Server HelpLink.BaseHelpUrl = http://go.microsoft.com/fwlink HelpLink.LinkId = 20476 DisableWatson = true Stack: at Microsoft.SqlServer.Setup.Chainer.Workflow.PendingActions.InvokeActions(WorkflowObject metaDb, TextWriter loggingStream) at Microsoft.SqlServer.Setup.Chainer.Workflow.ActionEngine.RunActionQueue() at Microsoft.SqlServer.Setup.Chainer.Workflow.Workflow.RunWorkflow(HandleInternalException exceptionHandler) at Microsoft.SqlServer.Chainer.Setup.Setup.RunRequestedWorkflow() at Microsoft.SqlServer.Chainer.Setup.Setup.Run() at Microsoft.SqlServer.Chainer.Setup.Setup.Start() at Microsoft.SqlServer.Chainer.Setup.Setup.Main() Inner exception type: Microsoft.SqlServer.Configuration.Sco.ScoException Message: Attempted to perform an unauthorized operation. Data: WatsonData = HKEY_LOCAL_MACHINE@SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\Microsoft SQL Server 10 Stack: at Microsoft.SqlServer.Configuration.Sco.InternalRegistryKey.OpenSubKey(String subkey, RegistryAccess requestedAccess) at Microsoft.SqlServer.Configuration.Sco.SqlRegistryKey.OpenSubKey(String subkey, RegistryAccess requestedAccess) at Microsoft.SqlServer.Discovery.RegistryKeyExistsPropertyValueProvider.GetPropertyValue(Object[] context) at Microsoft.SqlServer.Discovery.DiscoveryEnumObject.GetPropertyValueFromProvider(IPropertyValueProvider propertyValueProvider, String machineName, Object[] context) at Microsoft.SqlServer.Discovery.ObjectInstanceSettings.IsObjectFound(String machineName, String idFilter) at Microsoft.SqlServer.Discovery.Product.FilterObjectSet(ArrayList objects, String idFilter) at Microsoft.SqlServer.Discovery.Product.GetData(EnumResult erParent) at Microsoft.SqlServer.Management.Sdk.Sfc.Environment.GetData() at Microsoft.SqlServer.Management.Sdk.Sfc.Environment.GetData(Request req, Object ci) at Microsoft.SqlServer.Management.Sdk.Sfc.Enumerator.GetData(Object connectionInfo, Request request) at Microsoft.SqlServer.Management.Sdk.Sfc.Enumerator.Process(Object connectionInfo, Request request) Inner exception type: System.UnauthorizedAccessException Message: Attempted to perform an unauthorized operation. Stack: at Microsoft.SqlServer.Configuration.Sco.InternalRegistryKey.OpenSubKey(String subkey, RegistryAccess requestedAccess) Ineed to install SQL server 2008 R2 for one of the company softwares to work. Any immediate help will be greatly appreciated. Thanks Sonia

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• Open ports broken from internal network

  - by ksvi

  Quick summary: Forwarded port works from the outside world, but from the internal network using the external IP the connection is refused. This is a simplified situation to make the explanation easier: I have a computer that is running a service on port 12345. This computer has an internal IP 192.168.1.100 and is connected directly to a modem/router which has internal IP 192.168.1.1 and external (public, static) IP 1.2.3.4. (The router is TP-LINK TD-w8960N) I have set up port forwarding (virtual server) at port 12345 to go to port 12345 at 192.168.1.100. If I run telnet 192.168.1.100 12345 from the same computer everything works. But running telnet 1.2.3.4 12345 says connection refused. If I do this on another computer (on the same internal network, connected to the router) the same thing happens. This would seem like the port forwarding is not working. However... If I run a online port checking service on my external IP and the service port it says the port is open and I can see the remote server connecting and immediately closing connection. And using another computer that is connected to the internet using a mobile connection I can also use telnet 1.2.3.4 12345 and I get a working connection. So the port forwarding seems to be working, however using external IP from the internal network doesn't. I have no idea what can be causing this, since another setup very much like this (different router) works for me. I can access a service running on a server from inside the network both through the internal and external IP. Note: I know I could just use the internal IP inside of the network to access this service. But if I have a laptop that must be able to do this both from inside and outside it would be annoying to constantly switch between 1.2.3.4 and 192.168.1.100 in the software configuration. Router output: > iptables -t nat -L -n Chain PREROUTING (policy ACCEPT) target prot opt source destination ACCEPT all -- 0.0.0.0/0 224.0.0.0/3 DNAT tcp -- 0.0.0.0/0 0.0.0.0/0 tcp dpt:25 to:192.168.1.101 DNAT udp -- 0.0.0.0/0 0.0.0.0/0 udp dpt:25 to:192.168.1.101 DNAT tcp -- 0.0.0.0/0 0.0.0.0/0 tcp dpt:110 to:192.168.1.101 DNAT tcp -- 0.0.0.0/0 0.0.0.0/0 tcp dpt:12345 to:192.168.1.102 DNAT udp -- 0.0.0.0/0 192.168.1.1 udp dpt:53 to:217.118.96.203 Chain POSTROUTING (policy ACCEPT) target prot opt source destination MASQUERADE all -- 192.168.1.0/24 0.0.0.0/0 Chain OUTPUT (policy ACCEPT) target prot opt source destination

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• 2 Servers setup for redundency, backup

  - by minal

  I presently have 1 dedicated virtual server running my website/blog/mail, etc. This is on Hyper-V with 512MB RAM. Windows Web2008. With the VM, I have these running within it: SmarterMail – for emails MS DNS – I have my own nameservers on this server SQL Express IIS7 2 IP Address I have now leased 2 physical servers : P4 2.6Ghz 1GB RAM 80GB HDD. With these new servers, I get 2 IPs per server as well. These are running Windows 2008 Standard. With the VM the HDD was obviously on a RAID setup so I was not worried about hardware issues as it fell on the provider to manage. However, with the new servers the HDD is not RAID’d, hence my concern is that if it fails I need a backup position. What would be the most ideal setup to go for? I am thinking: Server 1: (Web/PrimaryDNS) DNS – NS1 SQL Express – OFF turn on when required, ie. Server2 is down SmarterMail – OFF turn on when required, ie. Server2 is down IIS 7 Server2:(SQL/Backup) DNS – NS2 SQL Web Edition SmarterMail IIS 7 How can I set it up so that if 1 goes down I can have everything on 2 instantly or by manual switching over. I am confused as other DNS servers will cache the web servers IP address for requests, and if that server goes down, the backup server will have a different IP. How do I make this work? I will be doing routine backups, in which case I will keep copies of backups on both servers. If I am copying the same stuff on both servers like a mirror then I am losing on using the true performance out of it. It's like 1 server is always on standby. Ideally I want SQL and web on 2 diff machines for best performance. If Server1 goes down, I should be able to switch to Server2 fairly easily. I don't have a problem with manual intervention to start the sql/mail services, etc. In terms of scalabilty, the VM has coped pretty well to date. Moving forward the SQL and IIS workload is going to double pretty quickly. Some ideas would be great.

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• How can I centralise MySQL data between 3 or more geographically separate servers?

  - by Andy Castles

  To explain the background to the question: We have a home-grown PHP application (for running online language-learning courses) running on a Linux server and using MySQL on localhost for saving user data (e.g. results of tests taken, marks of submitted work, time spent on different pages in the courses, etc). As we have students from different geographic locations we currently have 3 virtual servers hosted close to those locations (Spain, UK and Hong Kong) and users are added to the server closest to them (they access via different URLs, e.g. europe.domain.com, uk.domain.com and asia.domain.com). This works but is an administrative nightmare as we have to remember which server a particular user is on, and users can only connect to one server. We would like to somehow centralise the information so that all users are visible on any of the servers and users could connect to any of the 3 servers. The question is, what method should we use to implement this. It must be an issue that that lots of people have encountered but I haven't found anything conclusive after a fair bit of Googling around. The closest I have seen to solutions are: something like master-master replication, but I have read so many posts suggesting that this is not a good idea as things like auto_increment fields can break. circular replication, this sounded perfect but to quote from O'Reilly's High Performance MySQL, "In general, rings are brittle and best avoided" We're not against rewriting code in the application to make it work with whatever solution is required but I am not sure if replication is the correct thing to use. Thanks, Andy P.S. I should add that we experimented with writes to a central database and then using reads from a local database but the response time between the different servers for writing was pretty bad and it's also important that written data is available immediately for reading so if replication is too slow this could cause out-of-date data to be returned. Edit: I have been thinking about writing my own rudimentary replication script which would involve something like having each user given a server ID to say which is his "home server", e.g. users in asia would be marked as having the Hong Kong server as their own server. Then the replication scripts (which would be a PHP script set to run as a cron job reasonably frequently, e.g. every 15 minutes or so) would run independently on each of the servers in the system. They would go through the database and distribute any information about users with the "home server" set to the server that the script is running on to all of the other databases in the system. They would also need to suck new information which has been added to any of the other databases on the system where the "home server" flag is the server where the script is running. I would need to work out the details and build in the logic to deal with conflicts but I think it would be possible, however I wanted to make sure that there is not a correct solution for this already out there as it seems like it must be a problem that many people have already come across.

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• Python Django sites on Apache+mod_wsgi with nginx proxy: highly fluctuating performance

  - by Halfgaar

  I have an Ubuntu 10.04 box running several dozen Python Django sites using mod_wsgi (embedded mode; the faster mode, if properly configured). Performance highly fluctuates. Sometimes fast, sometimes several seconds delay. The smokeping graphs are al over the place. Recently, I also added an nginx proxy for the static content, in the hopes it would cure the highly fluctuating performance. But, even though it reduced the number of requests Apache has to process significantly, it didn't help with the main problem. When clicking around on websites while running htop, it can be seen that sometimes requests are almost instant, whereas sometimes it causes Apache to consume 100% CPU for a few seconds. I really don't understand where this fluctuation comes from. I have configured the mpm_worker for Apache like this: StartServers 1 MinSpareThreads 50 MaxSpareThreads 50 ThreadLimit 64 ThreadsPerChild 50 MaxClients 50 ServerLimit 1 MaxRequestsPerChild 0 MaxMemFree 2048 1 server with 50 threads, max 50 clients. Munin and apache2ctl -t both show a consistent presence of workers; they are not destroyed and created all the time. Yet, it behaves as such. This tells me that once a sub interpreter is created, it should remain in memory, yet it seems sites have to reload all the time. I also have a nginx+gunicorn box, which performs quite well. I would really like to know why Apache is so random. This is a virtual host config: <VirtualHost *:81> ServerAdmin [email protected] ServerName example.com DocumentRoot /srv/http/site/bla Alias /static/ /srv/http/site/static Alias /media/ /srv/http/site/media WSGIScriptAlias / /srv/http/site/passenger_wsgi.py <Directory /> AllowOverride None </Directory> <Directory /srv/http/site> Options -Indexes FollowSymLinks MultiViews AllowOverride None Order allow,deny allow from all </Directory> Ubuntu 10.04 Apache 2.2.14 mod_wsgi 2.8 nginx 0.7.65 Edit: I've put some code in the settings.py file of a site that writes the date to a tmp file whenever it's loaded. I can now see that the site is not randomly reloaded all the time, so Apache must be keeping it in memory. So, that's good, except it doesn't bring me closer to an answer... Edit: I just found an error that might also be related to this: File "/usr/lib/python2.6/subprocess.py", line 633, in __init__ errread, errwrite) File "/usr/lib/python2.6/subprocess.py", line 1049, in _execute_child self.pid = os.fork() OSError: [Errno 12] Cannot allocate memory The server has 600 of 2000 MB free, which should be plenty. Is there a limit that is set on Apache or WSGI somewhere?

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• Certain clients (IP range) can not ping server

  - by Logman

  I just virtualized a Windows 2003 Server SP2 x32. The server contained our help desk server (Spiceworks) and our anti virus management server (ESET RAC). The host computer actually contained the virtualized server originally; I created the vhd and then I wiped this system clean and installed Windows 2008 R2 x64 Datacenter and added the virtualized 2003 onto the Hyper-V 2008 R2 Server. I got the server running fine except for... certain ip ranges. Local clients can get updates from the AV server from my 192.168.180.xxx & 192.168.181.xxx BUT NOT from any 192.168.182.xxx, 192.168.183.xxx, 192.168.184.xxx etc... I can not ping the server from any clients except for the 180. & 181. ranges. Now I created 2 other virtualized servers (win2008 & a win7 pro) and they exist on the same virtual host as the 2003 server. And at first I could not ping those until I went to the "\Network and Sharing Center\Advanced sharing settings" and Turned On File and Print Sharing. Then I could ping and access those virtualized guests. Win2003 server isn't quite the same. But I am sure I have it on. But now when I ping from a client on one of those ranges that would not work I get this: As you can see the ping leaves our network. We have 2 ad/dns servers (one 180. & the other in the 181. range). Is it DNS? Both AD/DNS servers are Windows 2003. And we plan on upgrading both to 2008 R2 within a month or two but I need to fix this issue pronto (esp the AV end). btw, I did rename that 2003 Server (Spiceworks/AV) hostname. And I tried a CNAME. But I do not think that is the problem. EDIT: OR because this server existed on this hardware/computer before becoming virtualized?

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• Ubuntu 10.04 LTS - Dual monitor works only sometimes (ATI multi-desktop)

  - by Beres Botond

  I've been using my laptop with an external LCD monitor attached to it at work (Philips 201E). And at home with a different external monitor (Samsung 2032BW). I have an ATI graphics card (HD3450), with Ati Catalyst drivers enabled and I'm using the Single display desktop (Multi-Desktop) seeting. At work I have the external monitor on the left and laptop on the right, while at home the other way around. So when I switch between the two setups, I just needed to go to Ati Catalyst Control Center, change the order of the displays, change the resolution (Home - 1680x1050, Work - 1440x900), reboot and it was all fine. But since a while it doesn't work properly anymore: At home it still works fine. At work it doesn't work. Sometimes it works for some reason, after a few resolution/setting changes in ACCC and reboots... it's very strange and annoying. With the home monitor I can see the whole bootup process on both monitors (laptop + LCD) and it always just works fine. With the work monitor on the external LCD monitor I just see "No video input" until I get to the login screen, then it shows up there as well. But after login it will either: Flicker a few times, but then work OK. Or (more often) Flicker once and then go back to "No video input" again. I usually end up rebooting a few times until it works. Does anyone have any idea for fixing it? This is my xorg.conf currently: Section "ServerLayout" Identifier "amdcccle Layout" Screen 0 "amdcccle-Screen[6]-0" 0 0 Screen "amdcccle-Screen[6]-1" 1280 0 EndSection Section "Files" EndSection Section "Module" Load "glx" EndSection Section "ServerFlags" Option "Xinerama" "off" EndSection Section "Monitor" Identifier "0-LVDS" Option "VendorName" "ATI Proprietary Driver" Option "ModelName" "Generic Autodetecting Monitor" Option "DPMS" "true" Option "PreferredMode" "1280x768" Option "TargetRefresh" "60" Option "Position" "0 0" Option "Rotate" "normal" Option "Disable" "false" EndSection Section "Monitor" Identifier "0-CRT1" Option "VendorName" "ATI Proprietary Driver" Option "ModelName" "Generic Autodetecting Monitor" Option "DPMS" "true" Option "TargetRefresh" "60" Option "Position" "0 0" Option "Rotate" "normal" Option "Disable" "false" Option "PreferredMode" "1440x900" EndSection Section "Device" Identifier "Default Device" Driver "fglrx" EndSection Section "Device" Identifier "amdcccle-Device[6]-0" Driver "fglrx" Option "Monitor-LVDS" "0-LVDS" BusID "PCI:6:0:0" EndSection Section "Device" Identifier "amdcccle-Device[6]-1" Driver "fglrx" Option "Monitor-CRT1" "0-CRT1" BusID "PCI:6:0:0" Screen 1 EndSection Section "Screen" Identifier "Default Screen" DefaultDepth 24 SubSection "Display" Virtual 2560 1024 EndSubSection EndSection Section "Screen" Identifier "amdcccle-Screen[6]-0" Device "amdcccle-Device[6]-0" DefaultDepth 24 SubSection "Display" Viewport 0 0 Depth 24 EndSubSection EndSection Section "Screen" Identifier "amdcccle-Screen[6]-1" Device "amdcccle-Device[6]-1" DefaultDepth 24 SubSection "Display" Viewport 0 0 Depth 24 EndSubSection EndSection

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• Abnormal hangs and restarts Ubuntu 8.04

  - by jai-ho

  Hi, I am using Ubuntu 8.04 LTS and seeing the following behaviors: The system hangs after a while and becomes completely unresponsive. The system sometimes restarts itself ! Can you please help me identify what is the problem? Also please mention where should I look for the possible cause of this error. Thanks. EDIT: Got the following from the dmesg output (the system got hung and had to restart) [ 15.452015] Driver 'sr' needs updating - please use bus_type methods [ 15.456882] Driver 'sd' needs updating - please use bus_type methods [ 15.457987] sr0: scsi3-mmc drive: 52x/52x writer cd/rw xa/form2 cdda tray [ 15.457993] Uniform CD-ROM driver Revision: 3.20 [ 15.458058] sr 0:0:1:0: Attached scsi CD-ROM sr0 [ 15.463028] sd 1:0:0:0: [sda] 156301488 512-byte hardware sectors (80026 MB) [ 15.463051] sd 1:0:0:0: [sda] Write Protect is off [ 15.463055] sd 1:0:0:0: [sda] Mode Sense: 00 3a 00 00 [ 15.463083] sd 1:0:0:0: [sda] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA [ 15.463151] sd 1:0:0:0: [sda] 156301488 512-byte hardware sectors (80026 MB) [ 15.463167] sd 1:0:0:0: [sda] Write Protect is off [ 15.463171] sd 1:0:0:0: [sda] Mode Sense: 00 3a 00 00 [ 15.463197] sd 1:0:0:0: [sda] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA [ 15.463202] sda:<5sr 0:0:1:0: Attached scsi generic sg0 type 5 [ 15.464634] sd 1:0:0:0: Attached scsi generic sg1 type 0 [ 15.470120] sda1 sda2 < sda5 [ 15.495536] sd 1:0:0:0: [sda] Attached SCSI disk [ 15.759549] Attempting manual resume [ 15.759554] swsusp: Resume From Partition 8:5 [ 15.759556] PM: Checking swsusp image. [ 15.759742] PM: Resume from disk failed. [ 15.779964] EXT3-fs: INFO: recovery required on readonly filesystem. [ 15.779970] EXT3-fs: write access will be enabled during recovery. [ 19.904204] kjournald starting. Commit interval 5 seconds [ 19.904235] EXT3-fs: sda1: orphan cleanup on readonly fs [ 19.904245] ext3_orphan_cleanup: deleting unreferenced inode 303260 [ 19.904304] ext3_orphan_cleanup: deleting unreferenced inode 303329 [ 19.932763] ext3_orphan_cleanup: deleting unreferenced inode 3801871 [ 19.932785] ext3_orphan_cleanup: deleting unreferenced inode 3801874 [ 19.932798] ext3_orphan_cleanup: deleting unreferenced inode 3801910 [ 19.951253] ext3_orphan_cleanup: deleting unreferenced inode 3801912 [ 19.951266] ext3_orphan_cleanup: deleting unreferenced inode 3801914 [ 19.951278] ext3_orphan_cleanup: deleting unreferenced inode 3959212 [ 19.951299] ext3_orphan_cleanup: deleting unreferenced inode 3959213 [ 19.960335] ext3_orphan_cleanup: deleting unreferenced inode 3959215 [ 19.963531] ext3_orphan_cleanup: deleting unreferenced inode 3801875 [ 19.963545] ext3_orphan_cleanup: deleting unreferenced inode 3663727 [ 19.963565] ext3_orphan_cleanup: deleting unreferenced inode 3663708 [ 19.963577] ext3_orphan_cleanup: deleting unreferenced inode 4072122 [ 19.963597] ext3_orphan_cleanup: deleting unreferenced inode 4072157 [ 19.968616] ext3_orphan_cleanup: deleting unreferenced inode 4072159 [ 19.970252] ext3_orphan_cleanup: deleting unreferenced inode 4072160 [ 19.970264] ext3_orphan_cleanup: deleting unreferenced inode 4072161 [ 19.992889] ext3_orphan_cleanup: deleting unreferenced inode 4072264 [ 19.992903] ext3_orphan_cleanup: deleting unreferenced inode 4072267 [ 19.999585] ext3_orphan_cleanup: deleting unreferenced inode 4072268 [ 20.008329] ext3_orphan_cleanup: deleting unreferenced inode 4072270 [ 20.008343] ext3_orphan_cleanup: deleting unreferenced inode 4072123 [ 20.008360] ext3_orphan_cleanup: deleting unreferenced inode 4072452 [ 20.008374] ext3_orphan_cleanup: deleting unreferenced inode 4072453 [ 20.008385] ext3_orphan_cleanup: deleting unreferenced inode 4072124 [ 20.008398] ext3_orphan_cleanup: deleting unreferenced inode 311574 [ 20.008413] ext3_orphan_cleanup: deleting unreferenced inode 967890 [ 20.008420] EXT3-fs: sda1: 28 orphan inodes deleted [ 20.008423] EXT3-fs: recovery complete. [ 20.082622] EXT3-fs: mounted filesystem with ordered data mode. [ 29.025379] input: PC Speaker as /devices/platform/pcspkr/input/input2 [ 29.187133] Linux agpgart interface v0.102 [ 29.225338] iTCO_vendor_support: vendor-support=0 [ 29.259662] iTCO_wdt: Intel TCO WatchDog Timer Driver v1.02 (26-Jul-2007)

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