Verified answer

This doesn't sound right. Port 80 is used by your computer when it is acting as a web server.

the two the construction is on a single router to all residences, and no ports are forwarded (different than the router itself on port 80) or Comcast is obstructing all ports different than 80 (which could be unusual). Forwarding a port on your computing device on your router in basic terms forwards it from the cable entering your router on your computing device. If this is blocked greater beneficial upline, the internet can not get to that port on your computing device, using fact it can not get on your router. The port must be open each and every of ways from the internet on your computing device.