For those of you who are having difficulty connecting do this: When LW is open, click Tools->Options & go to Bug report & click for an example. In the window that appears scroll down to the part that says: "Recieved incoming this session" (about half way down the report.) If it says ‘True’ then LW has no problem with firewalls, but if 'False' it does have a prob.
If you're using Mac OSX then go to LW's Prefs-Bug Report, & for OS9 that's Options-Bug Report.
If you have a firewall/router blocking your connection, you'll need to open a port. For the most common firewalls, instructions can be found at the bottom of the following page:
http://www.limewire.com/english/content/firewalls.shtml