This is a weird one.
I have one user that has started having issues with the anyconnect vpn client.
When he enters his username and password the client does not even attempt to contact the vpn server. I have watched my ASA logs and the IP address associated with his home device is not being logged on the firewall. Immediately after he enters his username/password he recieves "authentication failed." However, I can log in via vpn on the same machine through vpn without issues and the ip is logged in the firewall.
Even when he uses a machine for the first time, the anyconnect client will not even attempt to connect, but immediately goes to the authentication failed message. We tested this on a brand new laptop right out of the box. I installed the client and asked him to login. It did the exact same thing.
I have verified that his user credentials are not locked in AD, we are using kerberos for authentication and using anyconnect client 2.4.1012. This error persist across all OSes that we have tried.
Also, I forgot to add. He was able to connect yesterday morning without issues and worked for 4 hours. After he disconnected was when the problem began.
Any help would be greatly appreciated and if you need any further information please ask.
John
