Nostalrius Begins - Quality wow vanilla realm (1.12)

So i was playing normally as usual, when i suddenly got disconnected from server, now i can't log back it, getting "disconnedcted from server" after 10seconds of "connecting", plase help, what is this bullshit?

This is happening to me as well. I posted below you.

Says "authenticating, success, connected, then disconnected"

While it is stuck on connected hit the escape key and then select Nostalrius Begins again.