What if I am behind a firewall?

If you are on a network which uses a firewall there are minimal settings which need to be verified with your Network Administrator in the event you have issues with the Martin Learning test page.  Check with your firewall administrator that Port 80 (HTTP Protocol) is open with TCP and UDP enabled.  Flash uses Real-Time Streaming Protocol (RTSP) which uses UDP.  Using a Proxy-based firewall such as Microsoft ISA Server with content filtering will not work.  Use the test page to resolve your firewall issues with your Network Administrator.