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• What value does SenderID provide over SPF and DKIM?

  - by makerofthings7

  I understand that SPF "binds" a message envelope to a set of permitted IP addresses. SenderID (with the default pra option) "binds" the message header to a set of permitted IPs in addition to the SPF logic. DKIM "binds" the from address header (and any additional header the sender chooses), and the body to a DNS Domain name I'm using the word "bind" above instead of "authorized" because it makes more sense (to me) Questions: If SPF is already verifies a message FROM in the envelope, why is there a need to check the headers? When would the need to verify the envelope (SPF) need to be different than the headers (SenderID) If I'm already verifying the headers with DKIM, why do I need SenderID? Most large companies I've checked don't disable SenderID with an explicit record. EBay is a notable example of one that does. What is the rationale for disabling SenderID "pra" processing of outbound messages?

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• No dual cpu support for VirtualBox with a CPU that doesn't support multicore?

  - by djangofan

  With VMWare it works fine and I can run multiple cores on a VMWare image. With Sun VirtualBox I can only run 1 cpu on a image. Its annoying. Why does Sun Virtualbox not work the same as VMWare in this respect?? My CPU is: XEON 3.00GHz Intel 90nm 2MBCache QUAD CPU x14 Socket 604 mPGA Family 15 Model 4(04) Stepping 3 Revision 05 MMX SSE3 XD SIV.exe tells me: No virtual machine extensions x86 with 64-bit support NO IA64 support MPS but with NO MCP 2 physical processors, 2 cores, 4 logical processors

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• Website with large number of users keeps going down due to memory leaks:Tomcat6 and Java 6

  - by user1766478

  We host many websites on one of our two virtual servers. We use tomcat 6 and Java 6. It is an MVC model with a hibernate like layer. The problem is, one of our biggest clients with the most number of members, keeps crashing the server every 6-8 hours(precisely in the mornings when most members login) We have been having this issue for 4 days now. Trying to figure out the problem but we suspect memory leaks. Any suggestions?

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• Mass change Microsoft DNS & IIS server settings

  - by Antonius Bloch

  I need to change about 100 DNS records and IIS configurations on a Windows 2003 web server. The gui doesn't accommodate it and the MS command line tools seem incomplete (for example: dnscmd cannot edit a record, only create). Is there a third party tool out there I can use? Basically I just need to change one IP address to another. <vent It's frustrating that what would take a simple search and replace in Linux is this massive exercise under Windows. I mean IIS 6 wasn't Microsoft's first web platform! What were they thinking??? </vent

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• How can I prevent my domain controller doing forward lookups for remote users?

  - by markmnl

  I have a Windows Server 2003 server in the office. I VPN into the LAN remotely. My VPN has a virtual NIC with the Windows Server as the primary DNS since it is a domain controller. When connected to the VPN and I do an nslookup or simply browse the web the DNS from the VPN provides the DNS answers. I believe this is because it has DNS forwarders, so queries it can't answer are forwarded and then it relays the answer. This is the desired behavior for workstations in the office (they should query their domain controller first); however for remote VPN users this is not desirable. I do not want my remote office's server to answer DNS queries it is not the authority of (which happens to be 192.168.x.x). Is there any way I can configure this?

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• How do I connect to my wireless router settings on Linux?

  - by Joshua Robison

  My network is as follows: Internet Provider's DSL modem connected to Internet Provider's router connected to My Buffalo Wireless router connected to My Toshiba Laptop via WEP network My Toshiba Laptop is running LMDE Linux Mint Debian Edition Service Pack 3 i686 kernel I have experience using various routers and their configuration settings but for some reason I can not access my wireless router. In my cromium browser I tried the following ip addresses: Standard Usual IPs : 192.168.1.1, 192.168.0.1 (connection hangs and goes no where) On the back of my router: 192.168.11.1, 192.168.11.100 (connection hangs and goes nowhere ) In some tcpip info: 192.168.24.1 (unable to connect error message) If someone could give me some terminal commands that will help me find my wireless router address or some trouble shooting ideas, I would be very thankful.

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• Help me set up ssl.conf for multiple domains (name-based vhosts in ssl.conf?)

  - by mmattax

  In my httpd.conf: If I have my virtual host configured as: NameVirtualHost *:80 <VirtualHost *:80 ServerName foo.com ServerAlias www.foo.com Include conf.d/foo.conf </VirtualHost <VirtualHost *:80 ServerName bar.com ServerAlias www.bar.com Include conf.d/bar.conf </VirtualHost Can I get by with a single domain SSL certificate or must I purchase a wildcard SSL certificate to handle the www subdomain? I am now trying to configure the ssl.conf file, can I use name-based vhosts in my ssl.conf file like this: NameVirtualHost *:443 <VirtualHost *:443 ServerName foo.com ServerAlias www.foo.com ... Include conf.d/foo.conf </VirtualHost <VirtualHost *:443 ServerName bar.com ServerAlias www.bar.com ... Include conf.d/bar.conf </VirtualHost or do I need IP based vhosts? If this is possible, what kind of cert would I need in order to do this?

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• ICS as guest in Ubuntu 12.04 host

  - by oshirowanen

  I have installed Android as per this guide as a guess os via VirtualBox: http://www.android-x86.org/documents/virtualboxhowto Using the following ISO: android-x86-4.0-RC1-eeepc.iso But I am unable to connect to the internet from within the android virtual machine. The host OS is Ubuntu 12.04 where the internet works fine. I have internet access via a usb wireless connection to the home router. All this is fine. If I install Ubuntu 12.04 as a guest, where the host is also Ubuntu 12.04. The guest os'es internet works fine out of the box. But for some reason, I can't get the above androids internet to work out of the box as the guest os. Anyone know what I am doing wrong?

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• Round-Robin DNS in mobile networks

  - by k7k0

  After reading load distribution alternatives and giving my limited skills on the area I'm biased toward round-robin DNS strategy. From what I understood, one key aspect of DNS Round-Robin is setting a low TTL value, avoiding caching. My main concern is that all my traffic comes from mobile networks, almost 30% of that comes from t-mobile 3G. Some questions: 1) Is there a chance that almost all clients on the same mobile network will be redirected to the same IP in the TTL frame? That would kill the distribution technique. 2) If I choose a really low TTL (zero or one). That impacts directly over client performance? It does a DNS miss every time or it's a setting that only impacts on DNS servers? Any help would be much appreciated. Thanks

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• Windows server 2008 rejecting packets from client

  - by l46kok

  We deployed a server application in .NET 4.0 that is going to run on Windows Server 2008 R2. Strangely, the clients cannot connect to the server given an external IP and the server port. I've ran wireshark diagnostics on the server computer and verified that the packets are arriving to the NIC without any issue so it seems Windows Server 2008 is the culprit here. I've tried to temporarily disable the firewall and add the server port into inbound/outbound rule but it still doesn't solve the issue. How can I solve this issue?

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• Unable to call through asterisk

  - by sk

  I want to create a voip service. I have installed asterisk-1.4 on a dedicated remotely hosted debian lenny distro. I made a sip.conf and extensions.conf so as to place a call between two sip phones(i am using xlite 3.0) installed in some other Windows PC. Whenever i switch this phones the asterisk console shows that Registration from '"1000"<sip:[email protected]>' failed for '122.168.10.254' - Peer is not supposed to register Where xx.xx.xx.xx is the server's IP. i.e my sip phones are unable to register with the asterisk server. Please help me to place call between two sip phones #sip show peers Name/username Host Dyn Nat ACL Port Status 2000 (Unspecified) D 0 Unmonitored 1000 (Unspecified) D 0 Unmonitored 2 sip peers [Monitored: 0 online, 0 offline Unmonitored: 0 online, 2 offline] # sip show registry Host Username Refresh State Reg.Time # sip show channels Peer User/ANR Call ID Seq (Tx/Rx) Format Hold Last Message 0 active SIP channels

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• Ubuntu to Ubuntu VNC over SSH tunnel

  - by rxt

  I have a Linux Ubuntu desktop at home, ssh enabled, vnc server installed, router rule configured. It all works, and at home I can connect via the local network from my Mac. From the outside I can login via ssh. I've configured putty as follows: session: host name and port number connection ssh tunnel: forwarded ports: L5900|192.168.0.23 the local address is: 192.168.1.45 When I make the connection I can login to the remote machine. Then I open Remote Desktop Viewer. I click connect protocol: vnc host: ? use host as ssh tunnel: ? I don't know what to use for the last two options. Which ip-addresses should I use?

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• Failed pinging a LAN card of the server from the client using shared internet connection

  - by bobo

  The server (Windows XP Pro SP3) has two LAN cards (LAN card A and B) and is connected to the internet using ADSL. The ADSL connection is shared to LAN card B using Internet Connection Sharing. The client (Windows XP Pro SP3) has one LAN card, and is connected to LAN card B of the server so that it has access to the internet. The IP address on the LAN cards are defined as follows: Server: LAN card A: 192.168.0.3/24 (manually defined by me) LAN card B: 192.168.0.1/24 (manually defined by Internet Connection Sharing) Client: LAN card: 192.168.0.123/24 (assigned by DHCP) Default gateway: 192.168.0.1 From the server, I can ping 192.168.0.123 successfully. From the client, it can access the internet without any problem. I can also ping 192.168.0.1 successfully but for 192.168.0.3, it failed with the Request Timeout error message. Why did the ping fail, and what should be done to make the ping possible? (all firewalls have been turned off.)

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• Raid HDD Boot up

  - by user234695

  My server is Power Edge 1950 running server 2008 32Bit, using 3 Physical SAS HDD as a Virtual 2 Disk configured for RAID5, with partition of C drive as OS and D drive as Data. Planning to format and install Server 2008 R2 64Bit so I insert a New Physical disk and configured as RAID5 and clone the C drive and D drive to the new hard disk. Now I need to test that the new hard disk is able to boot windows and work as expected. How do I test, I am not able to boot the windows by choosing the new harddisk, the bios show only the existing HDD, not the new one. Also, if I remove the old three hard disk, and leave the new harddisk and then am I able to boot the device, if I do this does my existing RAID5 configuration and data on the hard disk still remain.

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• DYNDNS setup with TightVNC on Windows Server 2008 R2

  - by StealthRT

  Hey all, i seem to be having a problem with getting ports to forward on my Windows Server 2008 R2 PC. I already set all my port forwarding for 5900/5800 on my router for my PC's IP address (192.168.1.22) but when i try to use the TightVNC PFPortChecker on port 5900 it tells me its not opened! I can not even connect to my DYNDNS server name (xxxxxxx.dyndns.org). As a side note, i am running Windows XP SP3 within a VirtaulBox inside Windows Server 2008 R2 but running the PFPortChecker in Windows 2008 R2 brings the same results as it does in the VM. I also added them to the Windows Firewall Advanced Security form to add those inbound ports for full access. What could i possibly be missing? Thanks for your time! David

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• DNS resolution over DHCP

  - by Eric

  I have a m0n0wall router a VMWare workstation running ubuntu a windows 7 workstation running the VM The ubuntu hostname is "renraku" From the windows machine I can't resolve dns automatically for this host. For example, when I ping renraku Ping request could not find host renraku. Please check the name and try again. However nslookup seems to work nslookup renraku Server: m0n0wall.local Address: 192.168.123.254 Name: renraku Address: 192.168.123.248 I don't get how to have ping to work with hostnames. The main goal behind this is to have my web server to work with hostnames instead of ip addresses EDIT : ping 192.168.123.248 works

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• Losing WLAN connections but maintaining internet connections on WIndows 7 Workgroup

  - by Di

  I have 4 computers all running Windows 7 networked in a Work group through Billion 7404vgp-m wireless router.All drivers and firmware for wireless adapters and router are up to date. Windows Firewall and Defender disabled.Disconnected ipv6. Running Nod 32 anti virus software. All have own static IP address 192.XXX.X.XXX. When I Reset the router all computers have Internet and LAN access for about 1 hour and then they will lose the LAN connection but maintain Internet connection. Resetting wireless adapters or restarting computers does nothing to fix this but resetting router will. What is causing this and how do I fix it. Thanks Di

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• VirtualBox / Ubuntu 10.04 Server

  - by SevenCentral

  I created a virtual machine using VirtualBox 3.2 and Ubuntu Server 10.04 x64. Everything works fine. I logged in. I mounted the VBoxGuestAdditions.iso file. However, I can't for the life of me find where in the operating system this was done so I can get the additions installed. I've tried /media, /cdrom, /mnt, etc... I'm obviously new at this. Can someone help figure out how to install the guest additions and how to locate the mounted file? Thanks.

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• After low level formatting can microsoft track previously pirated windows installed on pc

  - by Neelabh

  I am getting call from Microsoft and they are forcing me to purchase so many licensed software but my budget is not that much.. So they are asking for On-Site Audit (SAM Review)... So I did low level formatting of my All PC's and Installed Ubuntu. So can they track I installed pirated windows xp earlier on these system or I need to change hardware.. After formatting on what parameter Microsoft Track earlier piracy: 1) By any Harddisk ID 2) By any Motherboard ID 3) By any IP Address Please help me otherwise I have to borrow so much money for licensing fee. Thanks in Advance..

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• Cyrus: authentication failure: checkpass failed

  - by Nick

  I'm trying to get Cyrus IMAP (v 2.2 on Ubuntu 9.04) setup and working, but I'm having a bit of trouble getting the login working correctly. I've created a mailbox for my test user "nrahl": cm user/nrahl and then created a password: $ saslpasswd2 nrahl I'm attempting to connect to the mailbox using Thunderbird. I'm using the machine's LAN IP address as the host, and "nrahl" as the username. It connects to the server and prompts me for the password. When I enter it, I get "Login to server failed." in Thunderbird, and /var/log/mail.log shows: Apr 15 19:20:01 IMAP cyrus/imap[1930]: accepted connection Apr 15 19:20:09 IMAP cyrus/imap[1930]: badlogin: [192.168.5.21] plaintext nrahl SASL(-13): authentication failure: checkpass failed Part of /etc/imapd.conf with comments removed: sieveusehomedir: false sievedir: /var/spool/sieve #mailnotifier: zephyr #sievenotifier: zephyr #dracinterval: 0 #drachost: localhost hashimapspool: true allowplaintext: yes sasl_mech_list: PLAIN #allowapop: no #sasl_maximum_layer: 256 #loginrealms: example.com #virtdomains: userid #defaultdomain: sasl_pwcheck_method: saslauthd #sasl_auxprop_plugin: sasldb sasl_auto_transition: no

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• Apache, Django with mod_wsgi, and large request buffering

  - by Mukul

  In my setup of Apache 2.2 MPM worker and Django 1.3 with mod_wsgi 2.8, I need to support large POST request payloads. The problem is that when there are many such simultaneous requests, Apache uses up all the memory in the system and then crashes. It seems that Apache is buffering the requests completely in memory before executing the WSGI handler and passing it the request. Is there any way to control request buffering in Apache? The log shows the following error whenever the crash happens: [Wed Jun 29 18:35:27 2011] [error] cgid daemon process died, restarting Here's my virtual host's configuration: <VirtualHost *:8080> ServerName example.com ErrorLog /var/log/apache2/error.log WSGIScriptAlias / <path to django.wsgi> WSGIPassAuthorization on WSGIDaemonProcess example.com WSGIProcessGroup example.com XSendFileAllowAbove on XSendFile on </VirtualHost>

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• iptables: How to read this OPT string?

  - by alex

  I have a simple INPUT rule for iptables that logs any new connections to a logfile. --log-tcp-options and --log-ip-options flags are both set and I get the appropriate OPT output. One line of my log looks something like this: Nov 29 17:00:00 IN=venet0 OUT= MAC= SRC=x.x.x.x DST=x.x.x.x LEN=64 TOS=0x00 PREC=0x00 TTL=53 ID=37898 DF PROTO=TCP SPT=57755 DPT=8888 WINDOW=65535 RES=0x00 SYN URGP=0 OPT (0204057D010303010101080A3E521D4D0000000004020000) I would like to understand how to interpret the OPT string (bold). Is there some documentation available on what it actually means? How could I make it human-readable?

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• Does Outlook continue to auto-discover account settings for already configured accounts? Can it be prevented?

  - by Oliver Salzburg

  fail2ban just locked me out of our website because something from my desktop was hammering port 443 on the server (which is not in use). I saw my IP also requesting "GET /autodiscover/autodiscover.xml HTTP/1.1", so I assume that's what's going on on port 443 as well. But I only have 1 email account configured in Outlook and it's working just fine. The account is for the address [email protected] and said server will answer for example.com, but that server is not our MX and it is also not configured as an Exchange server in my mail account. So, why is Outlook still trying to retrieve those auto-configuration settings?

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• Set up router to vpn into proxy server

  - by NKimber

  I have a small network with a single LinkSys router connected to broadband in US via Comcast. I have a VPN proxy server account that I can use with a standard Windows connection, allowing me to have a geographic IP fingerprint in Europe, this is useful for a number of purposes. I want to setup a 2nd router that automatically connects via VPN to this proxy service, so any hardware that is connected to router 2 looks as though it is originating network requests in Europe, and any hardware connected to my main router has normal Comcast traffic (all requests are originating from USA). My 2nd router is a LinkSys WRT54G2, I'm having trouble getting this configured. Question, is what I'm trying to do even feasible? Should the WRT54G2 be able to do this with native functionality? Would flashing it with DD-WRT allow me to achieve my objectives? Any help/suggestions much appreciated. Neil

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• Cyrus: How Do I Configure saslauthd For Authentication?

  - by Nick

  I'm trying to get Cyrus IMAP (v 2.2 on Ubuntu 9.04) setup and working, but I'm having a bit of trouble getting the login working correctly. I've created a mailbox for my test user "nrahl": cm user/nrahl and then created a password: $ saslpasswd2 nrahl I'm attempting to connect to the mailbox using Thunderbird. I'm using the machine's LAN IP address as the host, and "nrahl" as the username. It connects to the server and prompts me for the password. When I enter it, I get "Login to server failed." in Thunderbird, and /var/log/mail.log shows: Apr 15 19:20:01 IMAP cyrus/imap[1930]: accepted connection Apr 15 19:20:09 IMAP cyrus/imap[1930]: badlogin: [192.168.5.21] plaintext nrahl SASL(-13): authentication failure: checkpass failed Part of /etc/imapd.conf with comments removed: sieveusehomedir: false sievedir: /var/spool/sieve #mailnotifier: zephyr #sievenotifier: zephyr #dracinterval: 0 #drachost: localhost hashimapspool: true allowplaintext: yes sasl_mech_list: PLAIN #allowapop: no #sasl_maximum_layer: 256 #loginrealms: example.com #virtdomains: userid #defaultdomain: sasl_pwcheck_method: saslauthd #sasl_auxprop_plugin: sasldb sasl_auto_transition: no UPDATE: When setting: sasl_pwcheck_method: alwaystrue in /etc/imapd.conf, login works correctly. So I'm assuming the issue is saslauthd related.

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