Question

I receive the error: 'You have been disconnected from the server. Reason: Error verifying STEAM UserID ticket' when I try to connect to a server.

Answer

Some users have reported encountering this message after their Steam account has been hijacked or stolen by another user. This message may be displayed if another user has logged in to your account while you are in a game.

If you have confirmed the message is not the result of a network outage and your password is rejected when you attempt to log in, please proceed to the Reclaiming a Hijacked Steam Account topic for instructions on retrieving your account.

If your password is not rejected upon login and you still receiving this error message, the issue can most likely be resolved by restarting Steam.

If restarting Steam does not resolve the issue, please exit Steam and delete the following files from your Steam directory:

* Steam.dll
* SteamUI.dll
* ClientRegistry.Blob

By default, the files may be found at C:\Program Files\Valve\Steam\ or C:\Program Files\Steam\ (the location on your machine will vary if you specified a different installation folder, or if you have moved your Steam installation).

Original von subset(x)
Steam beenden und die Datei clientregistry.blob im Steamverzeichnis löschen.

Steam starten und los geht's

MfG