For whatever reason, I couldn’t find a place in plesk to do this, and I just despise everything about plesk anyway… so I took the manual approach.
First, look in your /etc/xinetd.d/ directory and see if there’s a file named psa_ftp in there. If not, you might have to make this change in your /etc/xinetd.conf file.
Open up the file as root, and look for the following section:
Change the disable = no line to disable = yes as shown above.
Run the following command to restart xinetd
Good to go!
