I go into the System Preferences, Firewall, then Firewall Options. I can't select the "File Sharing (FTP)" entry to remove it. How can I?
Update: I'm running OS X 10.7.5, and nothing is enabled in the Sharing preference pane. At some point I must have turned on an FTP daemon for some testing, and forgot about it. I can do this:
$ ftp localhost Trying 127.0.0.1... Connected to localhost. 220 127.0.0.1 FTP server (tnftpd 20100324+GSSAPI) ready.
Turns out I could shut it off with:
sudo /bin/launchctl unload -w /System/Library/LaunchDaemons/ftp.plist
I still feel like I should have been able to block it in the firewall preferences pane.