Im not an expert (actually quite the opposite) but I just Spent The past 5 hours trying to resolve my firewalled status on LW and I think I NAILED it. In my norton personal firewall configurations I went to ADD program. I went through the limewire folder and gave EVERYTHING that it would allow access. I then went through the config program menu and changed all LW settings from CUSTOM to PERMIT ALL. AND IT WORKS!!!!!
Im not saying this will work for everyone but if youve got norton and youre having problems TRY IT.
BTW LOTR is THE MAN!!!