It's not software on your computer, the concept of telnetting is communicating directly with your modem device. The softw page you'd see would be the firmware within the modem itself. But by the sounds of it your modem is "simply" a modem with no internal NAT firewall.
I presume you tried changing the listening port within LW.
I wouldn't normally recommend this, but close LW, turn off your McAffee firewall temporarily until you've finished this test & re-open LW & see if you still get the brick wall at the bottom of LW's interface.
Have you seen this?
http://www.gnutellaforums.com/showth...threadid=49331
I don't see where your set up is to blame. The problem is possibly your isp.