Can't connect to VPN anymore after Windows Update

• Thursday, April 26, 2012 11:21 AM

   

   
  

  0

  Hello!

  Problem description

  I'm having some wierd problems with a L2TP VPN connection. I'm using Windows 7 Enterprise with Service Pack 1.

  I'm a software developer and use Visual Studio 2010 for my job. One of my customers has a VPN with L2TP setup. I need access to that VPN so I can retrieve his data. The VPN server that I need to access has FreeBSD.

  If I do a fresh install of Windows 7, including Visual Studio 2010, everything works great. I can connect successfully.

  I'm not sure about this, but since I updated my Visual Studio 2010 to Visual Studio 2010 Service Pack 1, I can't connect to VPN using L2TP anymore. At first I thought that may be a problem on the customers side but then I realized that I can connect to VPN with computers that do not have Visual Studio or computers that do not have the Visual Studio 2010 Service Pack 1 installed.

  I know that all of this make any sense but I'm out of ideas for solving this problem and I asking for your help/thoughts/suggestions.

  Thanks in advance.

  Some information:

  - The error when trying to estabilish a L2TP connection is 789: error during security negotiations with remote computer.

  - I can ping to that server, no problems.

  - My firewall is off.

  - The protocol is only CHAP V2 with optional encryption.

  - The server use certificate, not pre-shared key

  
  

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