It happened to me too
1)Maybe you used hacks and your ip detected-so open
Start->
Command->
Cmd->
and wirte this: ipconfig/release
Wait 10 seconds
Now write: ipconfig/renew
After this wait minute then write : ipconfig and try enter Warrock
If this won't work,wait until the next day coz i had it too and i waited 1 day and i had 4 servers[like i had befre]