Comcast's best friend in this is Verizon. I had scheduled a move to FOIS, but cancelled when I learned that Verizon blocks many incoming ports, and although I can re-direct web and FTP traffic to other ports, that's a game I'd rather not play. Verizon can also block other ports, once they detect activity they don't like. I cancelled. I don't understand this behavior by Verizon at all. The relationship betwenn the customer and Verizon should be deadly simple: I pay for a connection, and then use it however I want (like I do now). Verizon limits speeds up and down, and that's their way of controlling network saturation. Then I learned they don't allow servers, either. What a joke. I pay for a connection, and they determine how I use it? No chance. Wake up, Verizon!
FWIW, I only want to use web and FTP services to share digital pics with my family, and it's way more convenient than trying to constantly e-mail huge files.