Following the most recent update to uTorrent (version 3.3 build 29126) it was noticed that there was a problem with UDP trackers reporting a status of "Connection timed out" most of the time. Manually forcing an "Update Tracker" sometimes cured the problem but became very tedious to maintain. Investigations eliminated a problem with some of the trackers actually being offline temporarily, After a bit of tweaking, the fix proved to be quite simple. Open uTorrent and select menu item "Options" and then "Preferences". Under the "Advanced" section, scroll down to find parameter "bt.trans_disposition". Change the value of this parameter (which was set to 31) to the value 15, effectively switching off support for the new uTP header which is not backwards-compatible with older protocol handlers. Restart uTorrent. Problem solved.
It seems that the installation of the uTorrent update resets the value of parameter bt.trans_disposition, since I had previously set this to 15 on earlier advice.
