Login issue

Discuss Median XL!
Ascarion
Thunder Beetle
57 | 0
Really don't know where to put this topic in, so i try it here...
A character on my account can't create or login in games anymore, all other chars aren't affected...i would be very thankful if i could get any advice!
I always get the message "connection to battle.net lost" and on the right sight is written "server down"