Try the post just above this one
http://www.gnutellaforums.com/frostwire/58926-frostwire-much-better-than-limewire.html
Hopefully this might work for you, it did for me
Don't Know if the mccfee firewall is the same, haven't checked it in a couple of years (might work using the same principles)
Good Luck
Sgt