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06/10/2004 Entry: "BitTorrent/BitTornado: BlackICE and Cisco VPN preventing remote connections"

Post to the forums at degreez.net by me:

It took me quite a bit of time to figure out why I couldn't get the yellow light. Eventually I realized that not only did I need to stop BlackICE, a software-based firewall, but also that my Cisco VPN software, which has a service running even when not in use, was blocking something. Once I stopped both of those services people could connect to my PC (behind my DSL router and Linksys switch with port forwarding) and I got the green light.

TCPView from Sysinternals.com, the netstat command, and http://btfaq.com/natcheck.pl were also the biggest helps!

Also I discovered that you really don't need to open up that many ports to the outside. 6881-6889 should be enough. BT uses one incoming port per client application, not network client connection.