You could try changing the listening port back to 6346. But first, do this test & see what result you get. If that test doesn't work, means that LW's default port is blocked.
http://www3.limewire.com:6346
Do you see the firewall icon (brick wall)?

You need to read through this sticky
Connection problems? Check here first!
There's a lot of info in there. Most of it's not too technical, just go through it slowly

If you're stuck, post back with your details. Post #2 of the sticky shows the info we need.