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• What are the requirements for Windows Remote Assistance over Teredo?

  - by Jens

  I try to get the Windows 7 (or Vista) remote assistance feature to work, without using UPnP on the novices computer. After enabling Teredo on the expert's computer (that is in a corporate network, and therefore has teredo disabled by default), I tried to connect to the novice both using Easy Connect and the invitation file with no success. My triubleshooting included the following (so far). A connection to the novice from my home pc was successful, hinting at a misconfiguration on the experts side. Both computers have a "qualified" connection to the Teredo Server. Both computers have a valid Teredo IP, access to the Global_ PNRP cloud and can resolve names registered with PNRP on the other computer. The expert can resolve the PNRP Id automatically generated with an Easy Connect help request Both computers can ping the other's PNRP name. Both computers can ping the other's Teredo IP Address using ping -6 Now, I am a little stumped. I expected Remote Assistance to work at this point, since my corporate firewall has no Teredo filtering. What could RA cause not to work in this setting? Thanks in advance!

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• OpenVZ vs KVM for Linux VMs

  - by Eliasdx

  Hardware: Intel® Core™ i7-920, 12 GB DDR3 RAM, 2 x 1500 GB SATA-II HDD (no SoftRaid because Proxmox developers don't support softraid and they are sure you'll run into problems) Software: Proxmox VE with KVM and OpenVZ support and debian everywhere I want to run multiple Linux VMs on this server. One for a firewall (I want to try pfSense), one for MySQL, one VM for nginx (my stuff) and ~2 VMs with nginx for other people's web sites. I don't think that pfSense will run in an OpenVZ environment but it should run in KVM. The question is if I should setup the other VMs using KVM or OpenVZ. In OpenVZ they should have less overhead for the OS itself but I don't know about the performance. I heard that KVM is more stable but needs more RAM and CPU. I found this diagram showing a OpenVZ setup on the same hardware I'm using. This guy uses an own VM for each and every website which is running on his server. I can't think of any advantage why he's using so many VMs.

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• OpenVZ with bridged interfaces and VLAN

  - by Deimosfr

  Hi, I've got a problem with OpenVZ with bridged VLAN. Here is my configuration: +------+ +-------+ +-----------+ +---------+ br0 |VE101 | | | | OpenBSD |----->| Debian |------->| | | WAN |--->| Router | | OpenVZ | +------+ | | | Firewall |----->| br0 br1 | br1 +------+ +-------+ +-----------+ +---------+------->|VE102 | |br0 | | |VLAN br0.110 +------+ v +---------+ |VE103.110| +---------+ I can't make VLAN work on br0 (br0.110) and I would like to understand why. I don't have any switch so no problem with unmanageable switch. I've configured a VLAN interface on OpenBSD in /etc/hostname.vlan110: inet 192.168.110.254 255.255.255.0 NONE vlan 110 vlandev sis1 And it seems to be working fine. I've also adapted my PF configuration to work with VLAN but I don't see any incoming traffic. On my Debian Lenny, here is my interfaces configuration : # The loopback network interface auto lo iface lo inet loopback # br0 auto br0 iface br0 inet static address 192.168.100.1 netmask 255.255.255.0 gateway 192.168.100.254 network 192.168.100.0 broadcast 192.168.100.255 bridge_ports eth0 bridge_fd 9 bridge_hello 2 bridge_maxage 12 bridge_stp off # VLAN 110 auto br0.110 iface br0.110 inet static address 192.168.110.1 netmask 255.255.255.0 network 192.168.110.0 gateway 192.168.110.254 broadcast 192.168.110.255 pre-up vconfig add br0 110 post-down vconfig rem br0.110 It looks OK, but when I start my VE, here is the message: ... Configure veth devices: veth103.0 Adding interface veth103.0 to bridge br0.110 on CT0 for VE103 can't add veth103.0 to bridge br0.110: Operation not supported VE start in progress... So I've got one error here. I've followed this documentation http://wiki.openvz.org/VLAN but it doesn't work. I've certainly missed something but I don't know why. Someone could help me please? Thanks

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• PowerConnect 3548p SNTP and web interface not working

  - by Force Flow

  I have been unable to get SNTP and access to the web interface working properly on a Dell PowerConnect 3548p. In the logs, this message appears over and over again: 04-Jan-2000 20:19:29 :%MNGINF-W-ACL: Management ACL drop packet received on interface Vlan 172 from 172.17.0.3 to 172.18.0.10 protocol 17 service Snmp 172 is the management vlan. 172.17.0.3 is the DNS server 172.18.0.10 is the switch's IP address. The DNS server and the switch are located on different subnets and separated by routers. I am unable to access the web interface of the switch from the 172.17.x.x subnet. I can only access the web interface of the switch if I am accessing it from the 172.18.x.x subnet. There is also a managed linksys switch on the 172.18.x.x subnet on the 172 vlan, which has no problem with SNTP. I can also access it from the 172.17.x.x network. So, it stands to reason that this is not a firewall or routing issue, but with the 3548p switch. I suspect the issue is with management permissions/ACLs on the 3348p switch, but that's about as much as I've been able to determine so far. Any ideas?

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• Extract and view Outlook contacts attachment sent to Gmail

  - by matt wilkie

  A friend forwarded a contact list to my gmail account from Outlook (2007 or 2010, not sure which). I can see there is an attachment in gmail but when I save it to my local drive it's just a plain text file containing the text This attachment is a MAPI 1.0 embedded message and is not supported by this mail system. If I use gmail's "show original message" it contains in part: This is a multipart message in MIME format. ------=_NextPart_000_0016_01CC6656.CE12F030 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit ------=_NextPart_000_0016_01CC6656.CE12F030 Content-Type: application/ms-tnef; name="winmail.dat" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="winmail.dat" eJ8+Ih0VAQaQCAAEAAAAAAABAAEAAQeQBgAIAAAA5AQAAAAAAADoAAEIgAcAGAAAAElQTS5NaWNy b3NvZnQgTWFpbC5Ob3RlADEIAQgABQAEAAAAAAAAAAAAAQkABAACAAAAAAAAAAEDkAYASAgAACgA --8<---snip---8<-- GUC/9NKH95rABgMA/g8HAAAAAwANNP0/pQ4DAA80/T+lDvAm ------=_NextPart_000_0016_01CC6656.CE12F030-- How do I save the attached winmail.dat properly, and open the winmail.dat and extract the contact list? I'm running Windows 7 x64, but have access to an ubuntu linux vmware appliance if needed. I have Outlook 2010, but can't use it to connect directly to gmail as pop3 and imap are blocked by the corporate firewall.

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• cannot connect to vpn server (error 721)

  - by callmeblessed

  Hi I got 2 internet connections in my computer. One is using 3.5G HSDPA modem (vodafone huawei e220) and the other using mobile phone (cdma zte c261). Both are using different ISP and i have both. at the moment, i can connect to my office vpn using the HSDPA modem one. But when i tried to use cdma modem (dial up - mobile phone modem), i am just able to get "verifying username and password" and then after a few minutes it display error : Error 721 The Remote Computer didn't respond. I tried to ping into my office ip address, it got good result but still cannot connect to the vpn. I tried to turn off all my firewall (i'm using commodo) and has no response as well. In my cdma mobile phone modem Network connections I tried to allow iNternet connection sharing as well ... and turn on all Internet Protocol TCP/IP, File & Printer Sharing & Client for microsoft networks. But all of my effort has no effect. How to fix this problem ? note: my office using windows vpn as well. thank you .

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• What could cause an 101 Error in WAMP under Windows 7 ?

  - by Brayn

  Hey, I'be been using WAMP for local development for quite a while now but lately I've been getting an Error 101 message when I browse localhost sites. It's possible for this to have appeared after the last WAMP update but I'm not 100% sure on this. If I try again and again, after several page refreshes it works but it's really annoying! The exact error message is: Error 101 (net::ERR_CONNECTION_RESET): Unknown error. This is my configuration: OS: Windows 7 Apache: 2.2.11 PHP: 5.2.9-2 WAMP: 2.0 Also the local scripts connect to a remote MySQL server, they don't use the local MySQL(I don't know if it matters, just though I let you know). I've been looking into the apache logs and I've found the following. It seems that the apache server keeps restarting and I can't figure why: [Wed Oct 14 13:52:30 2009] [notice] Parent: child process exited with status 255 -- Restarting. [Wed Oct 14 13:52:30 2009] [notice] Apache/2.2.11 (Win32) PHP/5.2.9-2 configured -- resuming normal operations [Wed Oct 14 13:52:30 2009] [notice] Server built: Dec 10 2008 00:10:06 [Wed Oct 14 13:52:30 2009] [notice] Parent: Created child process 6784 [Wed Oct 14 13:52:31 2009] [notice] Child 6784: Child process is running [Wed Oct 14 13:52:31 2009] [notice] Child 6784: Acquired the start mutex. [Wed Oct 14 13:52:31 2009] [notice] Child 6784: Starting 64 worker threads. [Wed Oct 14 13:52:31 2009] [notice] Child 6784: Starting thread to listen on port 80. [Wed Oct 14 13:52:32 2009] [notice] Parent: child process exited with status 255 -- Restarting. [Wed Oct 14 13:52:33 2009] [notice] Apache/2.2.11 (Win32) PHP/5.2.9-2 configured -- resuming normal operations [Wed Oct 14 13:52:33 2009] [notice] Server built: Dec 10 2008 00:10:06 [Wed Oct 14 13:52:33 2009] [notice] Parent: Created child process 3572 [Wed Oct 14 13:52:33 2009] [notice] Child 3572: Child process is running [Wed Oct 14 13:52:33 2009] [notice] Child 3572: Acquired the start mutex. [Wed Oct 14 13:52:33 2009] [notice] Child 3572: Starting 64 worker threads. [Wed Oct 14 13:52:33 2009] [notice] Child 3572: Starting thread to listen on port 80. Also I've checked Windows Firewall and disabled any other protection that I have on this computer with no improvement. Thanks!

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• How to set up simple VPN for secure Internet connections over unencrypted Wi-Fi on Windows?

  - by Senseful

  I'm looking for a solution similar to the one in this question, except that I don't have a linux computer. I have windows computers that could be set up to accept VPN connections. Preferably I want to set this up on either Windows Server 2003 or Windows XP. I'd like to connect different devices (e.g. iPhone, iPad, laptops, etc.) that are on open unsecure wireless networks (e.g. the one's you see at places like Starbucks) to this VPN to ensure that all my data is secure. I found an article that shows that you can enable VPN connections on Windows XP. After following those steps, though, I'm not sure what to do. Which ports do I open on my firewall? Which VPN settings do I use on my devices such as the iPhone? Do I use L2TP, PPTP, or IPSec? What's the difference between these? Are there any other steps missing in that tutorial? I'm hoping that since Windows has this built in feature, that it will be much simpler to set up rather than having to deal with setting up something such as OpenVPN. If I follow those settings and enable port forwarding on port 1723, and then use the following settings on the iPhone: PPTP (IP Address) RSA SecurID: Off Encryption Level: Auto Send All Traffic: On Proxy: Off It shows "Connecting..." then "Disconnecting..." and the following error message: VPN Configuration A connection could not be established to the PPP server. Try reconnecting. If the problem continues, verify your settings and contact your Administrator. I'm using a user account that I enabled privileges to in the VPN settings on the Windows machine.

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• Tomato/DD-WRT router to act as switch & only NAT some port

  - by fseto

  BACKGROUND: I have a device that must use a real IP address. Currently, my ISP uses DHCP and I can have up to 4 real IP address assigned. However, the cable modem only have 1 ethernet port and it's connected to my router (running Tomato, but can run DD-wrt or other Openwrt if required). Question stems from how I can connect the additional device, requiring a real IP? EASY SOLUTION: would be to get a switch and connect to the CM, Router, and Device. But alas, I want to avoid this route, since: my wiring cabinet in my home is drawing lots of power and heat already Device will be unprotected by any firewall unable to monitor the traffic to/from device. Besides, what would be the FUN in that? =) IDEA: So what I want to do is to configure the router, so that one of the switchport is removed from the normal br0 bridge. Instead, I want to make it behave like a switch on the WAN port. What's the best way of doing this? Should I create another bridge on the WAN & the device port? Can a single port belongs to two bridges? or would I need to create a subinterface first? Would I need a DHCP-relay? Am I expecting too much from my poor cheapie router? +------+ | CM | +--++--+ || +----WAN---------------+ | / \ Router | | BR1? BR0 | | | \ | | | {NAT} | | | / | | \ | +-P0----P1-P2-P3-Wifi--+ | +------+ |Device| +------+

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• Linux VLAN Bridge

  - by raspi

  I have home network with VLANs, one for LAN, one for WLAN and one for internet. I'd like to use bridging so that instead of configuring these same VLANs to every machine, they had own VLAN ID and bridges were LAN, WLAN and internet. I've tried it but for some reason keep-alive/ttl seems to get broken because SSH sessions etc suddenly disconnects. We have this same setup working in workplace for 4+ years with 100+ customers but it's custom firewall/router hardware so accessing it is impossible. I know that it runs Linux. So what is Debian/Ubuntu default network settings doing wrong or is it just NIC driver/hw problem? I've tried to mess araund with ttl etc settings without any luck. The bad stuff is happening in the bridge because current VLAN-only setup works fine. interfaces: auto lo iface lo inet loopback # The primary network interface allow-hotplug eth0 allow-hotplug eth1 iface eth0 inet static iface eth1 inet static auto vlan111 auto vlan222 auto vlan333 auto vlan444 auto br0 auto br1 auto br2 # LAN iface vlan111 inet static vlan_raw_device eth0 # WLAN iface vlan222 inet static vlan_raw_device eth0 # ADSL Modem iface vlan333 inet static vlan_raw_device eth1 # Internet iface vlan444 inet static vlan_raw_device eth0 # LAN bridge iface br0 inet static address 192.168.0.1 netmask 255.255.255.0 bridge_ports eth0.111 bridge_stp on # Internet bridge iface br1 inet static address x.x.x.x netmask x.x.x.x gateway x.x.x.x bridge_ports eth1.333 eth0.444 bridge_stp on post-up iptables -t nat -A POSTROUTING -o br1 -j MASQUERADE pre-down iptables -t nat -D POSTROUTING -o br1 -j MASQUERADE # WLAN bridge iface br2 inet static address 192.168.1.1 netmask 255.255.255.0 bridge_ports eth0.222 bridge_stp on Sysctl: net.ipv4.conf.default.forwarding=1

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• Issues with VSFTPD / FTP on Linux Ubuntu server - Steps for Troubleshooting?

  - by jnolte

  I am dealing with an issue I am unclear on how to resolve and have been pulling my hair out for some time. I have been trying to configure an FTP user using the following (we use this same documentation on all servers) Install FTP Server apt-get install vsftpd Enable local_enable and write_enable to YES and anonymous user to NO in /etc/vsftpd.conf restart - service vsftpd restart - to allow changes to take place Add WordPress User for FTP access in WP Admin Create a fake shell for the user add "usr/sbin/nologin" to the bottom of the /etc/shells file Add a FTP user account useradd username -d /var/www/ -s /usr/sbin/nologin passwd username add these lines to the bottom of /etc/vsftpd.conf - userlist_file=/etc/vsftpd.userlist - userlist_enable=YES - userlist_deny=NO Add username to the list at top of /etc/vsftpd.userlist restart vsftpd "service vsftpd restart" make sure firewall is open for ftp "ufw allow ftp" allow modify the /var/www directory for username "chown -R /var/www I have also went through everything listed on this post and no luck. I am getting connection refused. Sorry for the poor text formatting above. I think you get the idea. This is something we do over and over and for some reason it is not cooperating here. Setup is Ubuntu 12.04LTS and VSFTPD v2.3.5 Thank you in advance.

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• Selecting Interface for SSH Port Forwarding

  - by Eric Pruitt

  I have a server that we'll call hub-server.tld with three IP addresses 100.200.130.121, 100.200.130.122, and 100.200.130.123. I have three different machines that are behind a firewall, but I want to use SSH to port forward one machine to each IP address. For example: machine-one should listen for SSH on port 22 on 100.200.130.121, while machine-two should do the same on 100.200.130.122, and so on for different services on ports that may be the same across all of the machines. The SSH man page has -R [bind_address:]port:host:hostport listed I have gateway ports enabled, but when using -R with a specific IP address, server still listens on the port across all interfaces: machine-one: # ssh -NR 100.200.130.121:22:localhost:22 [email protected] hub-server.tld (Listens for SSH on port 2222): # netstat -tan | grep LISTEN tcp 0 0 100.200.130.121:2222 0.0.0.0:* LISTEN tcp 0 0 :::22 :::* LISTEN tcp 0 0 :::80 :::* LISTEN Is there a way to make SSH forward only connections on a specific IP address to machine-one so I can listen to port 22 on the other IP addresses at the same time, or will I have to do something with iptables? Here are all the lines in my ssh config that are not comments / defaults: Port 2222 Protocol 2 SyslogFacility AUTHPRIV PasswordAuthentication yes ChallengeResponseAuthentication no GSSAPIAuthentication no GSSAPICleanupCredentials no UsePAM yes AcceptEnv LANG LC_CTYPE LC_NUMERIC LC_TIME LC_COLLATE LC_MONETARY LC_MESSAGES AcceptEnv LC_PAPER LC_NAME LC_ADDRESS LC_TELEPHONE LC_MEASUREMENT AcceptEnv LC_IDENTIFICATION LC_ALL AllowTcpForwarding yes GatewayPorts yes X11Forwarding yes ClientAliveInterval 30 ClientAliveCountMax 1000000 UseDNS no Subsystem sftp /usr/libexec/openssh/sftp-server

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• Running multiple copies of openssh-server (sshd) on Ubuntu

  - by cecilkorik

  I may be attacking this problem the wrong way, if so let me know. I have a server which is available through SSH from both the public internet and the local LAN. I would like to have two very different security policies for each, by running two copies of sshd with two different sshd_config files each on a different port. Some of the things I'd like to change is to allow password or public-key authentication on the LAN, but public-key only from the internet. All (real) users could login from the LAN side, but only certain authorized users would be individually whitelisted to login through the internet. As far as I can tell this requires having two different SSH daemons running on different ports with different sshd_configs. I am fine with the different ports part, I can easily forward port 22 to any port I want through my firewall. So my question is what is the best way to actually START the second sshd under Ubuntu 10.04 LTS. Is there a recommended way to do something like this? Surely I am not the first person with this sort of need. I have a bit of experience with upstart, and I can manually hack the second sshd into /etc/init/ssh.conf I suppose but I'm not sure if that will get overwritten by the package. However I do it, It's important to ensure both sshd processes always get restarted after any automatic or manual upgrade of the openssh-server package. Thanks in advance.

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• OS X superuser folders automatically created. Perusers launchd process appears to kill 501

  - by Ric Pen

  New Apple laptop OSX 10.8.2. I have used OS X but many years previously, and am not familiar with subtleties or changes in com.apple.launchd.peruser.x... I have previously (and in retrospect, foolishly) made changes to these rapidly spawned new peruser accounts (my initial reaction was that if ipfw was disabled, then I might well be under hacker attack, which I have dealt with, years ago), but I believe I was wrong, and the results of my efforts at preserving the system's integrity have in fact been destructive, overreactive, and have resulted in much work to restore. My understanding from other posts is that superuser protocols have changed quite dramatically since I bought the first developer version of OS X many years ago. Haven't developed on Apple much since then, w/ exception of WebObjects (IMO, much underrated at that time, and was more user friendly than ASP (prior to .NET, I vaguely recall). Creation of apparently nasty peruser folders appear to confound 501 process, which logs inability to find firewall (ipfw). Can someone help me with this? I am concerned that either the system is improperly configured, an application was improperly installed (although there is little here beyond Apple's SDK, which I find quite accommodating and intuitive). Still, I am a novice, only sporadically develop at this time, and would really just like to see this system running happily. Please offer assistance, in the form of potential info sources, or if you have had a similar experience, then perhaps scripts to suss out this issue. I do not wish to damage the system, but Apple's Developer connection and discussion threads do not appear to have dealt with this particular issue recently... Although I may well have missed something you have not - please apprise. Any assistance on this issue is very much appreciated - by an old guy, who wants to do some things which were fun about 20 years ago.

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• Google account gives ERR_SSL_BAD_RECORD_MAC_ALERT errors

  - by Kjensen

  A couple of days ago, I started being unable to connect to accounts.google.com, which handles logins to all kinds of google services. I get this error in Chrome: Error 126 (net::ERR_SSL_BAD_RECORD_MAC_ALERT): Unknown error. In IE I get this: I assume it is the same error, just wrapped up. I run Win8 RTM. On the SAME machine, using the same network card, in a VMWare workstation image running Win7, I am able to connect perfectly. On another of my machines on my network, I am also still able to connect with no problem. My girlfriend uses the same network and has also complained a couple of times about this error (google calendar) - but this is anecdotal, since her technical troubleshooting abilities stop at "xxxx is broken". Her machine runs Win7. ;) I have rebooted, cleared cookies, do not run any antivirus/firewall, have not changed network config. The first 3-4 days after installing Win8, I did not have any problems. I have also searched, and found a hint about enabling SSL2.0 in connection settings, which did not help. Anybody know something about this error and what I can do to fix it?

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• Disabling LDAP Signing on Windows PDC in Local Policy

  - by Golmaal

  I just tripped over my own feet it seems. Playing around on a Windows 2008 R2 server (set up as domain controller), I was intrigued by certain warning event (event id 2886) which says: "To enhance the security of directory servers, you can configure both Active Directory Domain Services (AD DS) and Active Directory Lightweight Directory Services (AD LDS) to require signed Lightweight Directory Access Protocol (LDAP) binds." So I thoughtlessly did some Googling and set the relevant policies which enforce LDAP signing. Now I don't remember but I may have done that using Local Policy. Now I have setup a pfsense box which must authenticate AD users via LDAP. While the firewall can communicate over secure channel, it is difficult to manage the same for other packages such as Squid and SquidGuard. So now I have to disable i.e. undo those policy changes. The problem is that they are greyed out! The policies in question are LDAP server signing and LDAP client signing. I don't remember what I did but when I access these policies from Local Policy editor on the server, they are set to "Require Signing" and are greyed out. The same policies can still be set via Default Domain Controller option in Group Policy editor. So how can I reset these greyed out policies? Thanks

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• "Network Error - 53" while trying to mount NFS share in Windows Server 2008 client

  - by Mike B

  CentOS | Windows 2008 I've got a CentOS 5.5 server running nfsd. On the Windows side, I'm running Windows Server 2008 R2 Enterprise. I have the "Files Services" server role enabled and both Client for NFS and Server for NFS are on. I'm able to successfully connect/mount to the CentOS NFS share from other linux systems but am experiencing errors connecting to it from Windows. When I try to connect, I get the following: C:\Users\fooadmin>mount -o anon 10.10.10.10:/share/ z: Network Error - 53 Type 'NET HELPMSG 53' for more information. (IP and share name have been changed to protect the innocent :-) ) Additional information: I've verified low-level network connectivity between the Windows client and the NFS server with telnet (to the NFS on TCP/2049) so I know the port is open. I've further confirmed that inbound and outbound firewall ports are present and enabled. I came across a Microsoft tech note that suggested changing the "Provider Order" so "NFS Network" is above other items like Microsoft Windows Network. I changed this and restarted the NFS client - no luck. I've confirmed that the share folder on the NFS server is readable/writable by all (777) I've tried other variations of the mount command like: mount 10.10.10.10:/share/ z: and mount 10.10.10.10:/share z: and mount -o anon mtype=hard \\10.10.10.10:/share * No luck. As per the command output, I tried typing NET HELPMSG 53 but that doesn't tell me much. Just "The network path was not found". I'm lost on how to proceed with troubleshooting. Any ideas?

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• Virtualbox port forwarding with iptables

  - by jverdeyen

  I'm using a virtualmachine (virtualbox) as mailserver. The host is an Ubuntu 12.04 and the guest is an Ubuntu 10.04 system. At first I forwarded port 25 to 2550 on the host and added a port forward rule in VirtualBox from 2550 to 25 on the guest. This works for all ports needed for the mailserver. The guest has a host only connection and a NAT (with the port-forwarding). My mailserver was receiving and sending mail properly. But all connections are comming from the virtualbox internal ip, so every host connection is allowed, and that's not what I want. So.. I'm trying to skip the VirtualBox forwarding part and just forward port 25 to my host only ip of the guest system. I used these rules: iptables -F iptables -P INPUT ACCEPT iptables -P OUTPUT ACCEPT iptables -P FORWARD ACCEPT iptables -t nat -P PREROUTING ACCEPT iptables -t nat -P POSTROUTING ACCEPT iptables -A INPUT --protocol tcp --dport 25 -j ACCEPT iptables -A INPUT -i lo -j ACCEPT iptables -A INPUT -s 192.168.99.0/24 -i vboxnet0 -j ACCEPT echo 1 > /proc/sys/net/ipv4/ip_forward iptables -t nat -A PREROUTING -p tcp -i eth0 -d xxx.host.ip.xxx --dport 25 -j DNAT --to 192.168.99.105:25 iptables -A FORWARD -s 192.168.99.0/24 -i vboxnet0 -p tcp --dport 25 -j ACCEPT iptables -t nat -A POSTROUTING -s 192.168.99.0 -o eth0 -j MASQUERADE iptables -L -n But after these changes I still can't connect with a simple telnet. (Which was possible with my first solution). The guest machine doesn't have any firewall. I only have one network interface on the host (eth0) and a host interface (vboxnet0). Any suggestions? Or should I go back to my old solution (which I don't really like). Edit: bridge mode isn't an option, I have only on IP available for the moment. Thanks!

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• Administrative shares in Windows 7 Pro not visible

  - by Chris Tybur

  My desktop machine has a clean install of Windows 7 Professional. For some reason the standard administrative shares Admin$, C$, D$, etc are not visible, either in Computer Management - Shared Folders - Shares or via net share. I also have a laptop with a clean install of Windows 7 Professional, and I can see the admin shares in both places. As such, I can map to \\laptop\c$ from the desktop, but I can't map to \\desktop\c$ from the laptop. I pretty much took the defaults during the Windows 7 installations. I've tried adding LocalAccountTokenFilterPolicy to the registry on the desktop, but that didn't work. On the desktop I've also disabled UAC, turned off Windows firewall, removed it from a homegroup, made sure file and printer sharing is turned on, but nothing has worked. There is some subtle difference between the two machines that I can't seem to find. I'm logging into both machines using a local account that is in the Administrators group. Both accounts have the same name and password. I really don't want to have to create a new share for the desktop's C drive, especially since C$ is visible and working on the laptop and therefore I should be able to make it work on the desktop. Any idea why the admin shares would work on one machine and not another? Or why LocalAccountTokenFilterPolicy would fail?

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• Why are certain folders in my XP network share really, really slow?

  - by bikefixxer

  I have a workgroup set up with Windows XP. My file "server" is running XP Pro and the clients are running XP home. I've turned simple file sharing off on the server because certain clients need access to certain folders and not to others, and I want to keep it that way. Therefore, I've used the granular sharing/security settings to enable certain clients access to certain folders. I'm using the net use command in a batch file on the clients to add the share when they logon so it's always available via a mapped drive or a shortcut. On some clients "My Documents" points to the mapped drive, but all of the local and application settings stay local. Everything works well except for accessing a certain folder on the network. It contains a lot of random batch files and self-executable programs I use for diagnostics and what not, and nearly every time I open the folder the computer hangs for 15-60 seconds. This happens on every machine, including the server (but not nearly as often as the clients). I've searched high and low and cannot figure it out and it's driving me crazy. Here are all the things I've tried to no avail: Disabled firewall (XP) and anti-virus (ESET NOD32) Deleted any desktop.ini file I can find in the share Disabled "automatically search for network folders and printers" Disabled "remember each folder's view settings" Set HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer NoRecentDocsNetHood = 1 Tried with mapped drives and with UNC shortcuts Ran CHKDSK Removed Read-Only attribute from all folders (well, tried to remove, it always came back on with a half check) Added the server's static IP to the hosts file on the clients I've tried monitoring the server's performance to see if anything makes sense. Occasionally the issue coincides with a spike in pages/sec (memory) but not always. Other than that, everything else seems normal. The anti-virus would seem to be the most likely cause to me considering the batch files and what not, but it still hangs when it is completely disabled. I'm at a loss and if anyone can help me with this I'd greatly appreciate it!

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• Proper web server setup

  - by DMin

  I just got myself a slicehost basic slice to play around with so I can learn how to setup web-servers. I have Ubuntu 10.04.2 installed on the server. I was able to successfully get the server up and running from scratch, these were the things I did - following this tutorial. I know this is probably just a starters tutorial, so, I was wondering if you guys can tell me what you like to do while setting up production servers. These are the steps that were followed : Update and Upgrade Ubuntu sudo apt-get install apache2 php5-mysql libapache2-mod-php5 mysql-server Backup a copy of and edit apache2.conf Set : 'ServerTokens Full' to 'ServerTokens Prod''ServerSignature On' to 'ServerSignature Off' Backup php.ini and then Change “expose_php = On” to “expose_php = Off” Restart Apache Install Shorewall firewall Configure Shorewall to only accept HTTP and SSH connections(in the rules file) Enable shorewall on startup Add the website to the server : sudo usermod -g www-data root sudo chown -R www-data:www-data /var/www sudo chmod -R 775 /var/www I want make this CommunityWiki but can't seem to find the option to do it. Please feel free to add any feedback on the processes and things I am doing right/wrong. Much appriciated, thanks! :)

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• Mounting any Windows share from OS X 10.7.5 suddenly stopped working

  - by user2169619

  I have problem with mounting Windows network shares from my OS X 10.7.5 - it worked but it stopped and nothing helps and nothing in logs. Here what I get when trying to mount it manually: mount -t smbfs //10.0.0.7/d /tmp/test When doing sniffing with tshark - no packet it sent through and I get immediately return from the command: mount_smbfs: server connection failed: Unknown error: -1 Nothing in /var/log/syslog.log and /var/log/kern.log. The Finder does not work either - it throws an error that something is wrong (in czech thus I'm not sending the message here). I just cannot connect to any network shares. In virtual Windows 7 in Parallels Desktop I can connect successfully, but not within the network share (so the Win7 is behind OS X NAT) but only with its own IP address. The Windows server share is on the same network segment connected through switch. Any advice how to debug and what can be wrong? I spent hours to find solution on Google and here but no-one with this kind of problem and I do not know how to further debug it since there is no meaningful log / trace etc. I can ping 10.0.0.7 and I can connect to FTP server on 10.0.0.7 - the Windows machine (XP) has firewall completely turned off. The problem is that with tshark, I'm not seeing any packet sending to 10.0.0.7 so it's not even trying to reach the server.

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• OS X can connect to Windows machine, but can't access shared folders

  - by Bonnie

  I can create new folders on my Windows XP machine, set them to "shared". On my Mac, I pick Finder → Go → Connect to Server → smb://192.168.1.4 → Connect → Name / Password. It even shows me all the names of the newly created shared-folders on my PC, but when I try to actually connect to any of them I get connection failed, there was an error connecting Any idea on what would cause that? The fact that it successfully gets so far—to actually showing me my PC share-names—must mean I have 99% of this working correctly, i.e. the physical connection, the IP address, the user name, the password, etc. Still, I can't seem to access the folders themselves. I've tried this with my Windows XP firewall on/off, and Norton AntiVirus on/off. Same problem. Everything did work fine, 4 months ago. Were there any odd OS X or Windows updates released recently? I always apply them all. smbclient on the Mac does correctly find the XP machine, my XP user name, and accepts my XP password. I get the following from that smbclient command: Doing spnego session setup (blob length=16) server didn't supply a full spnego negprot Got challenge flags: ... Got NTLMSSP flags: ... Got NTLMSP flags: ... Domain=[XPMACHINE] OS=[Windows 5.1] Server=[Windows 2000 LAN Manager] tree connect failed: NT_STATUS_INSUFF_SERVER_RESOURCES I'm not sure why a standard XP box can't "supply a full spnego negprot". Whatever that means. Using XP's RegEdit to change my IRPStackSize from 11... to 13, 15, 20, 22... still gives that "NT_STATUS_INSUFF_SERVER_RESOURCES" error on the Mac.

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• libvirt's dnsmasq does not respond to dns queries or provide dhcp

  - by Jeremy

  This is on Ubuntu 10.04 server, using KVM to run Ubuntu guests. This system has been working for a long time and I have not changed anything (other than applying security updates), but today I found dnsmasq no longer responds to requests. I cannot say how long this has been broken for me because I don't frequently use the NAT'd guests. So it could have started just after the last updates or some other event and I just now found it. I can connect to port 53 with telnet at 192.168.122.1. I've flushed ip-tables to be sure it wasn't firewall rules and that is not the problem. dnsmasq is running, virsh reports default network as stared. I can't find ANY information on troubleshooting libvirt dnsmasq except that it won't play well with other instances of dnsmasq, which is not the problem. I cannot even find where log entries might be for this service. Any ideas on where to look for more information? edit to add: I added another network and that one works fine. I guess I have a workaround but would still like to figure out how to troubleshoot this problem.

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• what to disable on Windows server? (by list of opened ports)

  - by javapowered

  I'm using HP DL360p Gen8 for HFT trading. I want to disable any network services I don't need cause I also want to try to disable Windows Firewall to test if this will improve perfomance. Could someone suggest what currently is turned on and can be likely turned off having ports list below? I need only RDP (also I drag & drop files via RDP) Proto Local Address Foreign Address State TCP 0.0.0.0:135 Term:0 LISTENING TCP 0.0.0.0:445 Term:0 LISTENING TCP 0.0.0.0:2301 Term:0 LISTENING TCP 0.0.0.0:2381 Term:0 LISTENING TCP 0.0.0.0:3389 Term:0 LISTENING TCP 0.0.0.0:47001 Term:0 LISTENING TCP 0.0.0.0:49152 Term:0 LISTENING TCP 0.0.0.0:49153 Term:0 LISTENING TCP 0.0.0.0:49154 Term:0 LISTENING TCP 0.0.0.0:49156 Term:0 LISTENING TCP 0.0.0.0:49157 Term:0 LISTENING TCP HIDEN:139 Term:0 LISTENING TCP HIDEN:3389 HIDEN:63373 ESTABLISHED TCP HIDEN:139 Term:0 LISTENING TCP HIDEN:139 Term:0 LISTENING TCP [::]:135 Term:0 LISTENING TCP [::]:445 Term:0 LISTENING TCP [::]:2301 Term:0 LISTENING TCP [::]:2381 Term:0 LISTENING TCP [::]:3389 Term:0 LISTENING TCP [::]:47001 Term:0 LISTENING TCP [::]:49152 Term:0 LISTENING TCP [::]:49153 Term:0 LISTENING TCP [::]:49154 Term:0 LISTENING TCP [::]:49156 Term:0 LISTENING TCP [::]:49157 Term:0 LISTENING UDP 0.0.0.0:68 *:* UDP 0.0.0.0:123 *:* UDP 0.0.0.0:161 *:* UDP 0.0.0.0:500 *:* UDP 0.0.0.0:4500 *:* UDP 0.0.0.0:5355 *:* UDP HIDEN:137 *:* UDP HIDEN:138 *:* UDP HIDEN:137 *:* UDP HIDEN:138 *:* UDP HIDEN:137 *:* UDP HIDEN:138 *:* UDP [::]:123 *:* UDP [::]:161 *:* UDP [::]:500 *:* UDP [::]:4500 *:* UDP [::]:5355 *:*

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