the gnutella.net file is in the preferences folder of your OS X Library, and contains a list of good peers LW tries to connect to on startup. Just on the off chance yours is corrupt, I was offering mine as a replacement. Honestly though, LW 4.2 should have NO trouble connecting, and your situation really has me confused, unless something beyond your computer is interfering.

[Ursula/LOTR: what kind of speeds do you get from www.magnetmix.com ? You're in Europe just now, right? Just wondering how reliable magnetmix is for checking download speeds]