Manual port forwarding almost always works, while UPnP doesn't work always even if the manufacturer claims it does.
Try going to this site
http://www.portforward.com/english/r...outerindex.htm and see if there are instruction for your router
note: Common things that people forget when doing this
1. Limewires manual port and listening port have to be the same number for this to work. (one between 50000 and 60000 recomended)
2. It is just as important to configure your computer to use a static IP (do not skip that step)
If you run into trouble or can't get it to work try posting the routers brand and model here