BitComet has a very nasty habit of hammering the tracker (sending frequent repeated announcements) when an announcement is not acknowledged by the tracker. Rather than send another in a minute or two, it starts sending them every 10-15 seconds. Trackers don't like that and will tell you so, sometimes disconnecting you altogether as you may have seen.
If it were me, I'd stop using BitComet.
BTW, I have no problem getting to the BitTornado site.
http://bittornado.com/download.html
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