Which earlier versions did you try?

Try deleting your LW Preferences folder whilst LW is closed; instructions here: Fixes for Limewire

Can you give us a total desciption of your set up:
1. OS version? (eg: Windows 98)
2. Connection type? (eg: dialup, broadband, cable, etc.)
3. Modem & router brand name & model numbers?
4. Where are you trying to connect from (home, school, work, etc.)?
5. What version of Limewire (LW) & Java do you have? (Go to LW's menu Help>About LW...) Will show both LW & Java version.
6. Who is your isp provider?
7. Are you sharing the connection with other computers or p2p sharing programs? If yes, please give details of set up.
8. 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?