1. Delete the LW prefs folder
Deleting LW Preferences folder in OSX
2. Go to LW's prefs (keyboard shortcut: Command (apple key) & Comma
⌘ , & select Connections & disable connect on start up.
3. In LW, click on File > disconnect. Wait 5 minutes, then File > connect.
4. If still problems;
REPLACE gnutella.net FILE,
but first Close LW.
The link below will take you to a file hosting site where you can download a file named gnutella.net.
zSHARE - gnutella.net
If that link doesn't work, try this other one.
gnutella.net