Cant connect to CWP - This site can’t be reached

Hi, yesterday was working and all of a sudden it stopped.

This site can’t be reached 192.168.11.250 took too long to respond.

I can connect trough putty and the cwp works locally at server side.

Tried this, but did not help
http://forum.centos-webpanel.com/index.php?topic=4946.0

Any ideas, solutions?