Well that means port 6346 which is the default for any gnutella program is blocked. My guess is it's your router. D-Link 524 has UPnP abilities. Make sure it's enabled, else if UPnP doesn't work well for it, manually forward a port. http://portforward.com/routers.htm

As for your softw firewall, did you set both limewire/gnutella & port 6346 to be open on your firewall? For LW that's Firewall configuration instructions (click on link)