I’m attempting to setup a client to server L2TP VPN. I’m getting the following error when setting up the client VPN connectoid: “Error 798: A certificate could not be found that can be used with this extensible authentication protocol”.
It is a 3rd party certificate. The OIDs for the machine certificate I'm using are:
Client Authentication (1.3.6.1.5.5.7.3.2) Server Authentication (1.3.6.1.5.5.7.3.1) Unknown Key Usage (2.16.840.1.113730.4.1) Unknown Key Usage (1.3.6.1.4.1.311.10.3.3) I also have the 3rd party root certificate in the machine [trusted root certification authorities] store.
I've gotten the error on both a windows 2000 workstation (domain member) and a windows xp home (workgroup member).
how do I troubleshoot this?
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Part of my initial problem may have been third-party Winsock LSPs
Event ID: 615 IPSec Services failed to initialize IKE module with error code may also be caused by IKE failing to initialize because of third-party Winsock LSPs.
http://www.microsoft.com/t
but in the end, I still got the “Error 798: A certificate could not be found that can be used with this extensible authentication protocol” message on one winxpsp2 test comp that was a domain member
even though I was using an imported microsoft enterprise CA issued machine cert (that actually worked on another machine for L2TP) I also tried web server certs and administrator certs.
and yes it had the private key & and root CA in the trusted folder
in conclusion, sometimes L2tp worked fine when a machine cert was imported and sometimes it did work at all. I could find no distinguishing features in the machines that worked and the machines that didn't. Additionally I couldn't find a helpful log or event that assited me in understanding why certain machines would recognize a machine cert for EAP or L2TP.
for this and other reasons I concluded to use EAP on PPTP for client VPN connections
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by: tim_holmanPosted on 2005-06-30 at 15:18:37ID: 14343146
Have you seen this troubleshooter?
http://support.microsoft.c