Maybe. I've heard (from a reliable source in the corporate office) that it various from time to time and place to place which ports/services are blocked.
They DO specifically forbid servers on residential packages in their TOS and they DO terminate anyone's account that is caught running a server. My understanding that the termination is final and there is no second chance. That said, I've run services on all those ports at some point and it worked, and most recently on port 22 (SSH). The last time I tried 20 and 21 I couldn't make it work, whether it was a firewall problem or Mediacom blocking the ports, I'm not sure, I didn't spend any time trying to troubleshoot the problem since it was just a quick temporary thing I was trying to run.
My advice is to use a real host rather than try to host > Does anyone know if Mediacom blocks ports 80, 20, 21, 23, 25,
and/or other signficant ports?
> Fred Atkinson