router4.limewire.com appears to be down atm. Since this will surely cause some connections problems, here is a list of alternate quick connect hosts, you can try.

connect1.bearshare.net
connect2.bearshare.net
connect3.bearshare.net

connect1.gnutellanet.com
connect2.gnutellanet.com
connect3.gnutellanet.com
connect4.gnutellanet.com

gnutella.hostscache.com

gnet2.ath.cx:6346