Greetings. Lately I faced the problem that won't allow udp trackers work correctly in uTorrent ver. 220.127.116.11746. Namely, the one I tested this with was udp://tracker.openbittorent.com:80/announce - it always shows "connection timed out" on any torrent. Some packet sniffing with wireshark showed that udp packets are rejected with port unreachable error. However, if I create a clean install of utorrent, with pure white settings.dat - udp trackers work correctly from this installation. So ok, I thought, maybe my old 250kb settings.dat from uT 1.5 era has a right for some rest after all that time, made all necessary settings again (with old resume.dat though), and udp trackers worked fine for some time in that configuration (around 15 hours probably), and then the same problem shows itself. So ok, I thought, maybe some of my settings make things go wrong, so I run another instance in parallel with /recover and new settings.dat, made all settings by hand again, aand... suddenly, it's working. (no luck on main one though) So it wasn't my settings, then what? Moreover, I copypasted my settings.dat from main instance to the new one and it worked too!. So, becoming more and more confused, I deleted all .dat files and their backups from main utorrent directory, except resume.dat and settings.dat. Problem still persists. So maybe paths have some relation to it (stupid suggestion, alright). So I renamed the dir and started "main" copy again. Created new allowing rules for firewall by the way, since it recognised renamed uT folder as a new program. Aaaaaaaand... problem persists. So, I give up. Just to be sure, before posting this, I backed up my settings.dat from main instance, creating blank one and ran it. udp trackers work. Moved old settings.dat back - udp trackers don't work. Any suggestions are appreciated.