Which fixes here have you tried?: If LW Will Not Connect
There are so many because so many different fixes have worked for so many different people!
If you haven't tried any yet, I'd start off by deleting/replacing your gnutella.net file & next thing would be deleting LW's preferences folder. After that, go through the whole lot.

If nothing there helps, you really need to post your system details. We can't help without those details - how can we guess your setup?? The help thread above tells you the details that we need, just like the forum rules do when you first register here