Article ID: 120348, created on Feb 27, 2014, last review on Sep 2, 2015

  • Applies to:
  • Plesk 12.0 for Linux
  • Plesk 11.5 for Linux


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

Status: Resolving address of
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


FTP server misconfiguration.


  1. Download the ProFTPd package from the '<OS>/opt/hosting/proftpd/' resource. Substitute '<OS>' value with an operating system of the server.

  2. Run installation with the following parameters:

    • On RedHat-based operating systems:

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

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

Search Words

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FTP Server stops

Error: FTP connection failed, please check your FTP settings. Repository error: Transport error: unable to create directory: Curl error: SSL connect error

Could not connect to server


550 SSL/TLS required on the control channel FTP

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