Nostalrius Begins - Quality wow vanilla realm (1.12)

When trying to log onto my account, using correct information, I am always struck with the "bad credentials" signal. When trying to log onto the game via the client I am struck with the "unable to connect" or "disconnected from server" signal. I don't know what to do. Ive restarted my computer, changed my password several times and yet the signals continue. Please offer me some help on what to do. I love the server.