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Knowledge Base

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

 
backup restore migrationplesk 11 x for linuxplesk 12 0 for linuxplesk 12 5 for linuxplesk onyx 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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