Unable to access a server via FTP: 550 SSL/TLS required on the control channel

Created:

2016-11-16 13:11:55 UTC

Modified:

2017-04-24 11:20:22 UTC

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Unable to access a server via FTP: 550 SSL/TLS required on the control channel

Applicable to:

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

Symptoms

Unable to access a server via FTP. The connection fails with the following error:

Status: Resolving address of domain.com
Status: Connecting to <server_IP>:21...
Status: Connection established, waiting for welcome message...
Response: 220 ProFTPD 1.3.4c Server (ProFTPD) [<server_IP>]
Command: USER username
Response: 550 SSL/TLS required on the control channel
Error: Could not connect to server

Cause

FTP server misconfiguration.

Resolution

  1. Download the ProFTPd package from the ' http://autoinstall.plesk.com/PSA_11.5.30/<OS>/opt/hosting/proftpd/ ' resource. Substitute '<OS>' value with an operating system of the server.

  2. Run installation with the following parameters:

  3. On RedHat-based operating systems:

        # rpm -Uvh psa-proftpd.rpm --force --nodeps
  4. On Debian-based operating systems:

        # dpkg --force-configure-any,hold,overwrite,depends --debug=463 --install psa-proftpd.deb
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