WotLK What's going on? Why can't I login to any realm?

[DragonfireEX4422]

Everytime I login, I get "Success" then it hangs for about 30 seconds and just ejects me back to the server list.

Why is this happening?

EDIT: Can connect now. Not sure why this has happened, though. I've read reports of Comcast preventing logins to Warmane, but this is no longer the case for me.