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

Refers to:

  • Plesk 12.5 for Linux
  • Plesk Onyx for Linux
  • Plesk 11.5 for Linux
  • Plesk 12.0 for Linux

Created:

2016-11-16 13:22:32 UTC

Modified:

2016-12-21 20:34:41 UTC

0

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

Symptoms

Unable to connect to FTP server:

# 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

Set Allow both secure FTPS and non-secure FTP connections in

Plesk > Tools & Settings > Security Policy .

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