3.3.5a connection problem (Login server down)

I just started playing wow again on wotlk on ragnaros and i played for like 3 days and than the next day when i tried to login it kept saying "login server down" i tried to flush dns and tried deleting cache and wtf files but nothin seems to work and than i found that in the realmlist it was "set realmlist logon.warmane.ru" i changed it to .com instead of ru and it started working, now i played for like a week and again from this day i started getting the message "login server down" and my friend is alredy playing on the same server on the same realm.. how can i fix this issue please help..