I have went to this site and it says it worked....
"1. Do this simple test for us. Using your browser go here: http://www3.limewire.com:6346/ The page should say 'Your test worked!'. What happens when you go there? If you can't reach that page it means port 6346 is blocked (often by your ISP). Don’t worry, most Gnutella clients will use a random port if 6346 is blocked. However, your ISP might filter Gnutella traffic."

Does this mean my ISP don't have a firewall enabled?