Comodo can neither update nor upload a suspious file

Is it a temporary problem? I am in Knox College, and we are required to install sophos, but I do not. I am using my PC browser to post this topic, so my computer is fine. I can download offline database through http://downloads.comodo.com/av/updates58/sigs/bases/bases.cav, so I think my school does not block Comodo connection.

I can use rating scan.

Somebody help me!

The error when update is unable to connect to server, when submit a file is 80072efd. According to Windows Update: FAQ - Microsoft Support, I think there might be some problem about my PC and Comodo server, but I don’t know what to do.

problem solved, windows firewall block the connections