The server and the OfficeScan agent use trusted ports to communicate with each other.
If you block the trusted ports and then restore network settings to normal after an outbreak, OfficeScan agents will not immediately resume communication with the server. Agent-server communication will only be restored after the number of hours you have specified in the Outbreak Prevention Settings screen elapses.
OfficeScan uses the HTTP port (by default, 8080) as the trusted port on the server. During installation, you may enter a different port number. To block this trusted port and the trusted port on the OfficeScan agent, select the Block trusted ports check box on the Port Blocking screen.
The master installer randomly generates the OfficeScan agent trusted port during installation.