TF2 - STEAM validation rejected
When attempting to join a community server, this error message appears. This was after the game server was updated, new login tokens, new account identity credentials. What am I missing?
This is caused by a sourcemod extension, specifically plugins using: https://forums.alliedmods.net/showthread.php?t=162489
Same issue. Disabling Connect extension helped
This issue is not caused by connect! This is a bug in the Steam authentication flow which allows an unauthenticated client to play for extended amounts of time, likely due to a transient failure in the Steam client.
I have no reproduction but rebooting the Steam service always fixes it. Going offline/online also worked the one time I tried it.
Disabling connect is not a true fix, the bug will still occur, players will not be authenticated and they will eventually be booted by VAC if the client doesn’t sort itself out in time.