Facetime & Message problem

Facetime & Messages problem (The server encountered an error processing registration.Please try again later).

I have problem with my iMac. I can't connect with my apple ID to messages and to face time. This problem appear few days ago after last software update. On my iPad2 this works with no problem. I restore my apple ID and Mac OSX mountain lion but problem still exsist!

I hope that you will help me to solve this problem.

Best regards!