Comcast is notorious for two things:
1) Terrible customer service
2) Questionable 'traffic shaping' tactics
They were caught a few years back shaping traffic on specific ports and more importantly sending TERM packets to bittorrent connections. It had the effect of dropping or constistently slowing torrents so that other traffic could get a fair share.
I wouldn't be surprised if they have some sort of filtering or shaping software running on the specific ports/packet sizes that you're using.
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