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Synology L2TP VPN Won't Work With Windows 7

Posted on 2014-01-20
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Last Modified: 2014-01-29
I have successfully configured my Synology Diskstation (Model DS212j running DSM 4.3-3776) as a VPN Server. I settled on the L2TP protocol so that I can access resources on my home network.

Everything works flawlessly when connecting using Windows 8 x64, but on my Windows 7 x64 machine I receive error 766.

See here for more information on this error.

I have tried connecting behind the same firewall from a remote location and I get the same results: Windows 8 connects just fine, Windows 7 does not.

Is there a registry key missing from Windows 7? Or is there a way to generate a client certificate that I am unaware of (that Windows 8 seemed to do automagically)?

I tried looking for any significant difference in the mmc Cert Store snap-in, but nothing really stood out.

Additionally, trying to connect with a PSK (although it looks to be properly configured on the Diskstation) yields a different error for both OSes. Still I'd be happier with the certificate method.

Any help would be greatly appreciated.
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Question by:RoloTony
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Expert Comment

by:akahan
ID: 39798835
Don't you need to download and install the certificate from the Synology box?

While this is intended for people using a particular IBM business server, I think the same steps would likely be necessary:

http://pic.dhe.ibm.com/infocenter/ibmfsb/v2r1/index.jsp?topic=%2Fcom.ibm.dashboard.doc%2FadmvpnCertAuthWin7.htm

http://pic.dhe.ibm.com/infocenter/ibmfsb/v2r1/index.jsp?topic=%2Fcom.ibm.dashboard.doc%2Fadmnetcfgwindows7.htm
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Author Comment

by:RoloTony
ID: 39800041
Hm, I see what you're saying, but why didn't I have to do that for Windows 8? Did it automatically pull the certificate?

I'm also confused as to why the PSK option fails to work at all. I am sure I am entering the correct key under the network adapter settings from the client.
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LVL 26

Expert Comment

by:akahan
ID: 39800626
What error is returned when you attempt to use PSK?
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Author Comment

by:RoloTony
ID: 39807183
Error Description: 809: The network connection between your computer and the VPN server could not be established because the remote server is not responding. This could be because one of the network devices (e.g, firewalls, NAT, routers, etc) between your computer and the remote server is not configured to allow VPN connections. Please contact your Administrator or your service provider to determine which device may be causing the problem.

I don't get this problem using the certificate option on Windows 8.1. I get the same error on both Win 7 and 8.1 if I attempt to use the PSK.

I am 99% sure I have these ports forwarded and that the PSK is entered correctly, but I will triple check.
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Accepted Solution

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RoloTony earned 0 total points
ID: 39807208
Well, I just figured it out.

Not sure why the PSK doesn't work, but I got Windows 7 to finally connect. I changed require encryption to optional in the advanced settings and it worked.

Thanks for your efforts!
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Author Closing Comment

by:RoloTony
ID: 39817288
I didn't have the proper advanced settings configured.
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