At some point my XP's built in firewall/TCP filter feature has gone awry. No matter how I try to set it, port 21 (FTP) is blocked. It is blocked even if TCP filter specifically allows port 21 to be open. It used to work fine, but FTP services went dead. I did find a fix though: I removed all references to TCP port numbers, turned off filtering, and installed ZoneAlarm instead of using XP firewall. But, why did it break???? XP had itty bitty buggie-poos I'd say.