My fav client is Azureus, I have also heard bitlord is good
I have heard that even if all of the above is well, if your ISP so chooses they will hammer any ports in the range of usual torrent networks, to try and combat some of the illegal file transfers that go on.
Changing the port it runs on can help with this sometimes - but dont forget to open up the port on any firewalls you have and like Drip said forward it from your router.
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Jay-qu
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