By kluelos
From forum_name, BitComet Forum
The yellow light is a simpleminded test, but it indicates that incoming traffic on your listen port is being blocked by a firewall. (Only a portion of these instances are due to the built-in firewalls in most routers, but these seem to give the most trouble.)
The firewalls you are encountering may be one or more software firewalls running on your computer, that you haven't configured to allow traffic through on your BC listen port, or possibly firewalls that you don't even know you have.
They could also be one or more firewalls that you are connecting through and don't know it. I would expect this in your situation. Most buildings use a router to distribute internet connections throughout the building. Most such routers have a built-in firewall to protect everyone, but it's quite possible the manager is entirely unaware of this, does not know how to change it, and wouldn't change it just for you anyway.
If that's the case, whoever set up the router may have left some ports open for anyone who might want to run a server. It does happen. Try setting the web server and email server ports as your listen port, see if either of them work. If you can't find one, then you'll just have to go with "no listen port" mode and make the best of it.