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  • Status: Solved
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L2TP VPN Fails to Contact Server

I have set up L2TP VPNs on tens of PCs without a problem.
However, I now have a PC which has the correct certificates installed but just refuses to connect. The server never registers a connection attempt from the client PC (Windows 7).
This PC is not under my control and seems to have a plethora of 3rd party utilities on it. The user is also someone who likes to meddle with the settings of their PC. I suspect that either the network ports are blocked by some other software or there is a config setting which is blocking L2TP (note that Point To Point Tunnelling Protocol does work).

Any help with diagnostics/troubleshooting would be appreciated.
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ajmcqueen
Asked:
ajmcqueen
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1 Solution
 
Krzysztof PytkoActive Directory EngineerCommented:
Looks like Advanced Firewall port blocking (?) Please, ensure that client allows for TCP 1701 (L2TP) port connection PPTP uses TCP 1723

Regards,
Krzysztof
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ajmcqueenAuthor Commented:
OK.
How do I check for that and if it is blocked how do I find out what's blocking it?

Thanks for your help.
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Krzysztof PytkoActive Directory EngineerCommented:
Try to use portqry2 to check if it's opened
http://support.microsoft.com/kb/832919

you can download it from
http://www.microsoft.com/download/en/details.aspx?id=17148

and how to identify what blocks it, it's not so simple. You need to check local firewall (built-in) or 3rd party firewall or anti-virus software. That's the most common issues.

Krzysztof
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ajmcqueenAuthor Commented:
Please do not close yet - will do some more tests
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ajmcqueenAuthor Commented:
Could not find a solution but other L2TP VPNs on same PC work OK - trying SSL VPN instead.
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ajmcqueenAuthor Commented:
Not really resolved but take pragmatic step of using different technology
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