I don't know about a lot of people here, but I think I may have found a solution to some of the connection problems for people.
I posted a forum yesterday http://www.gnutellaforums.com/showthread.php?t=66684 ...but kindly no one helped and I think thats pretty lame. I know a lot of other people are having the same problem as I was. I don't think the problem with most lies with the ISP as I have the same problem and have OPTUS NET. I think the problem is with limewire. But heres my solution anyways. I HOPE IT HELPS!

This solution is for people with;
XP Windows
limewire 4.8.1 Pro
Java 1.5.0_10
and using UPnP in their firewall settings originally.
(might work with other combos and settings)

1. Heres my solution that i came across...if you go to TOOLS and then OPTIONS and select the ADVANCED>FIREWALL CONFIG tab and select the 'MANUAL PORT FORWARDING' option.
2. Apply the settings and close the box.
3. Go FILE>DISCONNECT
4. Go FILE>CONNECT (This resets the connection...correct me if theres an easier way)
5. Go back to TOOLS>OPTIONS>ADVANCED>FIREWALL CONFIG and reselect 'USE UPnP'
6. Repeats step 3 and 4

You should find that limewire now has a connection unlike before.