Interestingly, I just now encountered this duplicate connection issue but while acting as a leaf in LimeWire 3.9.12 beta. It made 3 connections simultaneously, the same second, to the same ultrapeer at the same IP on the same port (verified by a "netstat -nt" in linux showing the same IP connected to 3 times on the same port) . During this, the quality meter was at "Excellent" and "Locale Preferencing" was disabled. This occured on a fresh load of LimeWire and it stayed connected 3 times to the same IP on the same port for a few minutes before dropping one of the duplicate connections to find another ultrapeer, but it still had one duplicate connection to the same ultrapeer up for the entire time I had limewire loaded. My O/S is SuSE Linux 9.0 and java version is 1.4.2_04.