If you are running the Azureus Bit Torrent client, and update it to the new version 2.3.0.0 that was released today, you will need to change your Bit Torrent service definition in ASL, since the new Azureus version uses UDP as well as TCP on port 6881. The UDP port is used for the distributed database service that underpins the new built-in virtiual tracker.
Your service definition should now look like this:
Define a service in ASL called BT-6881.
Type = TCP+UDP
Source port = 1024:65535
Destination port = 6881
You need to first change your Bit Torrent SNAT rule temporarily to use a different service, in order to free up the BT-6881 service for editing. Once the service has been edited to include both TCP and UDP, simply change the Bit Torrent SNAT rule back to the proper service. It took me less time to implement the fix than it took to write this memo.
The new Azureus 2.3.0.0 client is pretty slick. It is a fine update to an already very good java software package.
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