There have been suspicions in the past that Comcast blocked SSH. This was supposedly selective, and geared towards blocking users "abusing" SSH for file sharing.
Well, I use SSH for work, to log into a linux box I host websites on, and I dont' share files doing this. Today, after a long successful history of use, I can't SSH into the box on my Comcast Business Class connection. Nothing on my network has changed, and I was able to connect a terminal as late as yesterday.
I can get a terminal through my AT&T Business Class DSL connection, my iPhone's 3g connection, and my Air Card's 3G connection. I rebooted my Comcast modem, and still no dice.
Is Comcast playing dirty poker and blocking SSH connections on Port 22?