I was having the same problem as everyone else...things were working fine and then suddenly **NOTHING** Couldn't get a connection to save my life.

I've been poking around the 'net and I have found answers. Yes, answers my friends!

It appears the source of the problem is the hosts which Limewire (or likely any other gnutella client) attempts to connect to. I stumbled across this "tracker" page:

http://www.gnufrog.com/

It provides an updated listing of working hosts. The first entry I tried worked like a charm. Use any one of the listed hosts in your 'connections' tab.

Enjoy!