I have only experienced similar problems while running tor exit node, even with
very restricted exit policy. Allowing exit only to port X, and unable to
initiate connections to port Y (typically Y=HTTPS=443, of course X =/= Y).
Note that those problems are not Comcast's fault, although they do point to
more general problem: that people (webmasters, cloud services, ISPs) sometimes
block too much and misunderstand tor, they probably wanted to block just tor
exits, but end up blocking anything tor-related.
This leads me to following idea: Educational campaign to teach relevant people
about difference between middle relays and exits. My proposal for title/slogan:
"Tor relays are not a threat - no reason to block them". (Should it be "middle
relays"? But it seems too long then.) EFF could be quite helpful there.
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