In the right place? Learn about basic firewall features on Firewall Overview.

A firewall is designed to block applications that send info out or allow it in. Problems arise when the firewall blocks applications that are legit. This is a list of commonly-used, legit applications and the ports they use so that you can make exceptions to these applications in your advanced firewall setup.

• Allow Incoming Echo Request - Allows local computer to reply to ICMP echo requests(ping) verifying it is on the network

• Allow incoming timestamp request - Allows local computer to reply to ICMP timestamp requests, gives date set on local machine
• Allow incoming mask request - Allows local computer to respond to ICMP requests for network and subnet currently set
• Allow incoming router request - Allows local computer to respond to ICMP router advertisements/ solicitations
• Allow outgoing destination unreachable - Local computer may inform outside network whether or not it can access addresses locally
• Allow outgoing source quench - Local computer can issue source quench commands to ask other host to slow data transmission
• Allow outgoing parameter problem - Local computer can send information if ICMP messages have problems
• Allow outgoing time exceeded - Local computer may reply when timeout is exceeded on ICMP requests
• Allow redirect - Local computer may reroute ICMP traffic on the local network

Questions? Contact the ACT Help Desk, (858) 534-1853.