As mentioned by other people here as well, I believe that UPnP is broken in the latest version of Limewire (4.16.3). I say this because all my other UPnP enabled applications are forwarding ports fine with UPnP, but Limewire (since I "upgraded" from an earlier version which did handle UPnP correctly) is not.

I know how to forward ports manually on my router, however, p2p networks suffer considerably when automatic port forwarding isn't working properly for the majority of people who don't know what a port is, much less how they should forward one.

Please could the devs get on to this ASAP?