I've been running the latest beta of LW 4.9.x for weeks on my Win2000 box, with JRE 1.5.0_04, but I'm yet to switch to UP mode. Why?

My suspicion is that the program thinks it can't or shouldn't because I'm not manually opening the TCP-7346 port on my firewall; I'm relying on the UPnP code to do it automatically. Searches and file transfers work great, so I know LW is connecting to the Gnutella cloud.

Does the UPnP code *not* allow two-way transfers through hw firewalls? Does it allow two-way's but still avoid UP mode, as I suspect?