Try using some of the higher numbered ports. Try between 50,000 and 60,000 just try different numbers. Sometimes they don't block the higher ports. With LimeWire open go to Tools/Options/Advanced/Firewall config choose Manuel port forward and put the number you want in the box. Also set the listing port to the same number. But I think your ISP may be supplying you with a firewall that needs to be configured. I do not know what the other kind of protection they are referring to in the screen shot I provided above is. But it may be a firewall.
http://www.gnutellaforums.com/attach...7&d=1145212675
I must really be getting slow. 2 replys while I typed out 1