Nostalrius Begins - Quality wow vanilla realm (1.12)

Hey, so pretty new here, am having an issue logging in. i enter my password, hit login and it insta comes up saying disconnected from server. anyone know what would cause this?

Jack

I am not sure what actually causes it but I had it happen to me a few times when I tried to login this morning. Probably has something to do with the connection to the authentication server but that's just a guess. All I can say is try to login again and if it fails try again. Worst I had was 2 failures then no issues so far. If anyone could shed light on the actual cause I would appreciate the knowledge as well.