Yes and no. From my experience, Qwest forcibly blocks incoming requests on ports 80 (http) and 21 (ftp). So, you can get around it by just using a non-standard port. It sucks somewhat but at least this work around exists. You wouldn't believe how many hours I blew trying to figure out why my server wasn't working LOL.
Anyhow, so does Cox block any ports? I think both Qwest and Cox both state you aren't supposed to run servers... but does Cox forcibly block any ports like Qwest does?
I'm loving my new Qwest dl speeds. I get around 155KB/sec now

I know Cox can dl faster but Qwest is better for running servers.