I have run into a situation where in the last month 3 users have been getting the below error message when trying to use their VPNs.
"The L2TP connection attempt failed because there is no valid machine certificate on your computer for security authentication. (Error 786)"
Other users are still working correctly, and from what I can tell nothing is wrong with the accounts of the users. I checked the certificates both locally and on the CA server for the 3 accounts and they are still in their valid period (not expired yet). The machines are in an Active Directory domain.
I have tried rebooting, gpupdate /force, group policy is set to autoenroll and renew, deleted the certificate off the CA server and the client and had it re-created (through rebooting as well as http://CA\certsrv
, and I doublechecked the permissions of the RSA folder on the clients.