(Not important but just FYI: Actually the di-link 604 does support UPnP, but you may need a firmware update to get it. Manual port forwarding will most likely be guaranteed/more reliable anyway. Under the UPnP section here http://www.gnutellaforums.com/showth...threadid=51357
Not that it matters, as that's not to do with your problem, but just to let you know you probably can use it after a firmware upgrade. The 'Setting up UPnP for DI-Link' link has the link to firmware updates for the 604.)