kalo it sounds like it might be your wireless set up that's causing an issue. If it doesn't utilise UPnP (Universal Plug & Play) which allows LW to communicate directly with the device to open a port, then you may need to manually forward (open) a port for LW.
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?
Can you tell us the brand & model no.'s of your connection devices? ie: each one.
Where are you trying to connect from (home, work, school, etc.)?
Are you on a shared connection with other computers?