hey gang- im looking to write a little script/tool (php perhaps?) that would test if a certain person is behind a firewall and is blocking a specific test. Problem: Potential client downloads an app, tries to log in for sales demo, gets warning about not being able to connect to port 5xxx and that it might just be a firewall. Goal: Have sales person visit a webpage that would test if they can connect (at some level) to these ports (5xxx), to avoid the downloading/installing client and then finding out that they cant connect. Any ideas on how this would be done? thanks duncan