Ping Plotter uses standard windows-style ICMP echo requests. The first thing to do would be to check your firewall documentation on how to enable "PING" or "TRACE ROUTE" requests through the firewall. Keep in mind that Windows style and unix style requests are somewhat different.<br><br>Unfortunately, I don't have any specific information on configuring a firewall to work, so all I can do is offer general advice (like that above). If you do find the setting for this, I'd love it if you could post it here so others can use that information.<br><br>Thanks!<br><br>