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

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Alexandr Tumanov
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Applicable to:

  • Plesk Onyx for Linux
  • Plesk 12.5 for Linux
  • Plesk 12.0 for Linux
  • Plesk 11.x for Linux

Symptoms

Unable to connect to FTP server on Plesk:

# ftp domain.tld 21
550 SSL/TLS required on the control channel
Login failed.
Remote system type is UNIX.
Using binary mode to transfer files.

Cause

Allow only secure FTPS connections option is enabled.

Resolution

  1. Log into Plesk
  2. Set Allow both secure FTPS and non-secure FTP connections in
    Plesk > Tools & Settings > Security Policy
    Screenshot_2019-01-14_at_11.45.23.png

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