cannot connect to any server (6)

I have a problem when I try to start the game.
This problem was mentioned may times but there were no answer of the question.
When I start the game after I tried it one time before it says that I'm already logged in.
Then I try it again and I get to the server selection. After that I want to select a server but I get a message like "cannot connect to any server (6)"
I re-installed the launcher and rebooted my computer but the messages arrived everytime.

please help me
i want to join this server

 

its says "No game server is available to the authorization server.(6)"