Need help with new server

[Uber Kitty]

My friend just got a new server for tf2; however, we cannot join.

Something like "Cannot verify UserID ticket" or something.

Any ideas?

[AciD]

Versions of server and your client are different. Wait for server update.

[Beerdude26]

Versions of server and your client are different. Wait for server update.No, then you get the "Different Classtables"-error. He simply has to restart his computer.