Have you retried it, made sure it wasn't the server? I think if there are a zillion people in there and others trying to enter, maybe a couple people at the same time, it could get overloaded.

That and/or your own internet provider might be "slow" so you're timing out the chat server trying to get in. Software will only try things for X amount of time before it gives an error message; if "you" are too slow it could time out somewhere.

I think it's just a default error message that gives the most usual reasons for not being able to get in at any given time. Mayb not have anything to do with the actual problem.