"You have been disconnected from the server" problem.

I'm logging into the game. I choose my character and the game opens. 15 seconds after opening, the game returns to the login screen and it gives an error. "You have been disconnected from the server". I have tried many times but I still get the same error. What should I do. I removed the Cache file, and the Realmlist settings are correct. Is there another option?

i have the same problem, and have done the same things, even redownloaded the game a few times, still not working.