Nostalrius Begins - Quality wow vanilla realm (1.12)

Whenever I try to log in it keeps prompting me with the message "disconnected from server" it either prompts this instantly or pulls my chain by saying "authenticating" first then disconnects me. I have tried the locks and resetting my password and running as admin but none seem to work. I play on the PvP server and I have an alliance mage called Mikasa with some alt codes for the name and a horde priest called Jaktraz. Idk what to do about the issue I've browsed the forums and tried everything but nothing seems to work.