ports 6881-6889 are the standard (default) ports for the BitTorrent protocol. Many ISPs block these ports because more than likely, 60%+ of their traffic is bittorrent related.
The beauty of programs like Azureus is that they allow you to change the ports that you will be using the protocol on. I personally use 10500-10510. You need one port open for each torrent file you are using. This will not effect the speed, client/tracker negotiation or anything like that. You just need to make sure that you have tcp _and_ udp port forwarded to the specific IP address that you are downloading your BT files to.
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"You hear the one about the fella who died, went to the pearly gates? St. Peter let him in. Sees a guy in a suit making a closing argument. Says, "Who's that?" St. Peter says, "Oh, that's God. Thinks he's Denny Crane."
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