Can't login into the game

Hi Folks,

i can't login into the game but don't have any problems at login into the website.
When i change Config.wtf to realmlist to "logon.warmane.com" and the start the game to try logon i get blizzard error message.
I make these changes with the local Administrator and the "only-read" button is unchecked.

After i check the Config.wtf again the realmlist is set back to "logon.molten-wow.com".

I would like to play and need help. :)

Best regards
Gokhan

Go in the Data -> enUS -> realmlist. change it to set realmlist logon.warmane.com