OK thank's for your solution, mr. pete and mr. mithun,
Symantec Endpoint Protection with Network Threat Protection was instaled, there are 120 client instaled, but I don't check network traffic log one by one, So if I can't check from console, I try to Wireshark, thank's
one again, can you tell me are there some virus or any, can broadcast to internet or another computer that's the network was down ??
thank's