Authentication on our 3015 concentrator is handled by Microsoft Radius (IAS). Under the server's Events/System Logs we have the following error appearing:
"A request was received with an authenticator that is not valid from client Cisco VPN 3000."
We seem to get 3-4 errors after every successful authentication. I'm beginning to suspect it's client related (v3.6.3) since the errors don't appear when I "test" the authentication from the VPN admin webpage. Everything seems to work fine, I just don't know if this is an issue or not.