There seems to be a problem with DNS lookups on router.limewire.com recently. Some of the other host caches you can try include:

connect1.gnutellanet.com:6346
connect2.gnutellanet.com:6346
connect3.gnutellanet.com:6346
connect4.gnutellanet.com:6346
connect5.gnutellanet.com:6346
connect6.gnutellanet.com:6346
connect7.public.bearshare.net:6346