I recently wrote a treatise about why being firewalled causes problems with downloading; if you're curious about it, please feel free to visit http://bt.degreez.net/firewalled.html
You can use this forum to ask how to fix your troubles; please state whether you are on a university network, whether you are behind a Cable/DSL Router and what brand and model, and what security software you are running.
Getting stuck behind a yellow light can be very frustrating. You may try fix after fix with no success. Please note that you may have several things stacked up in your way, and you may need to eliminate them to simplify your task. After taking the appropriate precautions, like running Windows Update and updating your antivirus software, uninstall any software firewalls and bypass your router, plugging directly into your uplink. Assuming Windows isn't blocking your port or you are able to convince Windows to open it, then add back the router and the firewalls one at a time, and work on them separately to figure out how to forward ports.