I am using the trial version of Net Firewall 188.8.131.52 and I LOVE IT! Will definitely be purchasing. I am using it as a personal firewall for a Windows 2003 Server running terminal services. Secruity level is set to high. My entire network is located behind a separate firewall/router.
I want to block outbound ICMP Echo Reply from outside my network but allow it within. Blocking it on the internal network prevents the system from responding to the domain controller and results in a 1054 event error in the application log stating that “Group Policy processing aborted”.
I have rules allowing certain IP and UDP traffic on my internal network and VPN connections, but I have not been able to find the right combination to allow ICMP Echo Reply on the internal network but block it from external. It is really not a problem for this server because an external ping cannot get through the firewall/router, but I would like to know if this is possible because I have another server that is in a DMZ.