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Setting up VPN LT2P on w2k server

RRAS, VPN, TS/RDP, Routing and remote Access.

Setting up VPN LT2P on w2k server

Postby jnash2001 » Wed Sep 19, 2007 10:12 am

Hi all!
Currently I have w2k server and a winxp client working without
problems with PPTP vpn.

I want to migrate to a L2TP setup.
So far I've installed the certificates services on the server which
issued me a certificate AFAIK.
On the client I've accessed the IIS server of w2k and requested a user
certificated which then was installed without probs.

The trouble is when connecting to w2k server, through L2TP vpn, I get
this error:

Error 781: The encryption attempt failed because no valid certificate
was found.

I've seen some posts around with this error but haven't been able to
solve this out.
Hope you can shed some light.
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Postby chicagotech » Wed Sep 19, 2007 11:45 am

Assuming you have correct certificates in both server and client, make sure the IPSec Policy Agent service is running. or try to stop and then start it.
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Postby jnash2001 » Thu Sep 20, 2007 4:34 am

That didn't work, besides I had already had rebooted both client and server.
I'm suspecting the certificates are wrong or don't match.
Any tips on that?
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Postby guest » Thu Sep 20, 2007 4:56 pm

I would double check the machine certificate. This auoted from MS may help too.

Error 766
Connections that use the L2TP protocol over IPSec require the installation of a machine certificate, also known as a computer certificate. You will see this error message when such a certificate is not available.

Typically, this error is generated on a remote access server that has active L2TP ports configured, the remote access service started but there is no certificate in the computer certificate store. This generates an event log message that tells the administrator that L2TP ports will not be able to accept calls until a certificate is acquired and RRAS is restarted.

Error 781
This error message appears when the connection requires a certificate, and no valid certificate was found on the client while trying to make an L2TP call. However, this error is quite similar to Error 766 and troubleshooting methods for both these error messages will follow the same path.
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