Belkin (from what I hear) has unreliable UPnP. You could try portforwarding

Remember to set up a static IP. Also remember that the listening port and the forwarded port should be the same number. Preferably one in the 50000 to 65000 range eg. 64049

Find your specific make and model here and then choose Limewire. You will get instructions on how to do this

www.portforward.com