I've been trying to set up a L2TP VPN server using a Preshared Key (PSK) on a Windows Server 2003 workgroup-based server. The router has the appropriate ports forwarded. I can see using the Microsoft Network Monitor utility that both UDP Ports 500 and 4500 are making it through to the server, but my client computer (Windows 7) fails to connect.
While trying to figure out what's wrong, I noticed the following error in the Event Viewer on the server:
Event Type:Warning
Event Source:RemoteAccess
Event Category:None
Event ID:20192
Date:6/9/2012
Time:2:25:49 PM
User:N/A
Computer:[ServerNameHere]
Description:
A certificate could not be found. Connections that use the L2TP protocol over IPSec require the installation of a machine certificate, also known as a computer certificate. No L2TP calls will be accepted.
Oddly enough, searching on multiple search engines and forums, I can't seem to find an explanation of what this error means and how to resolve it. This definitely wasn't mentions in the support articles on Microsoft's web site on setting up a L2TP VPN server doesn't mention anything about certificates.
Just to note, PPTP connections to the server are currently working fine.
Can anyone provide some insight on this error and how it can be resolved? Thank you.
(Yes, I know. Certificate-based is better than Preshared Key, but I gotta work within the means I've been given, so Preshared Key it is.)
- Travis Tubbs travis@travistubbs.net http://travistubbs.net