Firewall Test 1 - If you're new to computer security, then Firewall Test 1 is for you. It checks your system for commonly used ports. It also tests for ports commonly used by Viruses and Trojans. On average, your computer [should not] have any open ports. Firewall Test 2 - Advanced Firewall Testing. You can scan predefined ports from 1 to 65,535 or type in just the ports you wish checked. These firewall tests are broken up into blocks (modules) that helps prevent the possibility of 'Denial Of Service' issues that could otherwise occur during the firewall test.