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How to reconfigure standard Mac OS X FTP server to run on another port? For example 2021 instead of 21?

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According to the man page, you need to change the port number in /etc/services from 21 to 2021.

Once you've made the change, just stop/start the service in System Preferences.

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You may also need to to restart the ftp daemon for it to take effect : In Terminal --> run "launchctl stop" ** then run ** "launchctl start" – CaseyIT Apr 6 '10 at 11:34

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