Nostalrius Begins - Quality wow vanilla realm (1.12)

Hello, my friend Docleas cannot connect to the game, even though he had no problems before. When he writes his password and tries to connect, after a while, it's written: "Disconnected from server". His login ID is Docleas. He erased the WTF file but it changes nothing, so he put it back. His friends cannot connect on the game from his computer either so he's not banned.

Thanks for your quick answer!

Hey everyone!

I erased and reinstalled the game, entirely following Narkon's guide. Still cannot connect.
A few days ago it was ok, I don't understand.

Nobody has the same problem? How can I solve this? The forum locked subject didn't help.
Please, we want to play badly between friends :p