Hello After I restart my one of the server that monitor all traffic in my network suddenly i noticed that his monitoring service run out of the work and nothing to do.!!!

It's problem occurred when i update my windows server and i should restart it. after searching in internet i found it's problem. http://technet.microsoft.com/en-us/library/ee692772.aspx For this kind of server in network WMI performance adapter service is vital to be active. And I've just started it and my problem solved.