I have a legit error 3102 and don't know how to get out of it

I left my game logged in on a computer away from home. I'd love to play tonight but I'm getting a 3102. I wish there was an auto AFK-kicker or at least something that would kick you out of the game if you tried to log in someplace else.

Am I hosed for tonight and need to wait until customer service is awake tomorrow to kick me off, or is there something I can do?

This really seems like a poor execution of multiple machines logging into the same account.