FTP connection does not work on Plesk: FTP 550 SSL/TLS required on the control channel

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    Julian Bonpland Mignaquy

    Edwin C Since the error you are receiving is quite general I recommend opening a support ticket with us for further troubleshooting: https://support.plesk.com/hc/en-us/articles/213608509-How-to-submit-a-request-to-Plesk-support-

     

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    Edwin C (Edited )

    After enabling both secure and non-secure FTP passive mode fails to work.

    Update: After lot of testing the issue was found to be due to the "MasqueradeAddress" parameter. This does not allow both ftps and passive mode ftp on a server using NAT. Also, changing the mode to only non-secure ftp in the panel does not remove this configuration and hence passive mode still fails.

    FYI, all plesk updates are installed and plesk onyx runs on Ubuntu 16.04 with systemd.

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