iP problems

[Glenn at home]

You know, I wonder if my ISP could be blocking any kind of FTP traffic on 
the common FTP ports?
Has anyone ever heard of an ISP doing this?
Seems to me I remember something about that, and my ISP was down for an 
evening while they did something with its ports, a couple of years ago, 
about the time I first got on with CableOne.net.
This would explain why I could never get serv-U to work in windows as well.
Thanks for any ideas here.
Glenn