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Unable to establish FTP connection to Plesk server: Insecure server, it does not support FTP over TLS

 
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Symptoms

Unable to establish FTP connection to Plesk server with the following error message:

Insecure server, it does not support FTP over TLS

Cause

Misconfiguration of FTP SSL Settings for Plesk server IP address.

Resolution

  1. Connect to the server via RDP.

  2. Open Internet Information Services (IIS) Manager at Start > ​Windows Administrative Tools page.

  3. Go to server_name > Sites > 203.0.113.2 > FTP SSL Settings page.

  4. In the drop-down menu select Plesk as SSL Certificate:

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  5. Press Apply to save changes.

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