Certificate validation failure for device based authentication
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05-20-2025 12:48 AM - edited 06-05-2025 11:54 PM
Update: The issue has now been resolved
Just one user is experiencing the issue
But another user can connect using the same machine when the other user login
Also, from the login screen, can connect
SO its mainly break when the particular user logged in
One error log from event viewer
Function: CCertStore::GetCertificates
File: c:\temp\build\thehoff\vpn\commoncrypt\certificates\certstore.cpp
Line: 225
Ignoring client certificate because it does not contain the required EKU extension. Certificate details:
Store: Microsoft Machine,
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Cisco Software

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06-05-2025 08:25 AM
this does not sound like a Cisco problem? this is a client issue.
my guess is the certificate needed to be in the computer-certificate store, but was loaded in a user-specific certificate-store
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06-05-2025 11:53 PM
Thank you for the suggestions
Yes figured it out
The app was set to select any certificate like client one or device one, and it was trying to use the user certificate (obviously) , the user store had two similar certificate (which is weird) , so it was failing as it cant detect which one to use.
We have revoked the cert from the user from AD and republish it, worked
