Just so I don’t have to answer this again. If you use a Linksys router, and appear to be firewalled when you use BitTorrent, do this:
Go to Status / Local Network / DHCP client table. See what your local IP address is. It’s likely to be between 192.168.1.100 and 192.168.1.150.
Go to Applications & Gaming / Port Range Forwarding, and enter:
IP Address: (your local IP address that you found earlier)
and save changes. Your ports will be open!