- Plesk 11.5 for Windows
- Plesk 12.0 for Windows
Cannot connect to FTP server, the following error is shown:
Response: 534-Protection level negotiation failed.
Response: Win32 error: Access is denied.
Response: Error details: Protection negotiation failed. PROT command with recognized parameter must precede this command.
Response: 534 End
Error: Failed to retrieve directory listing
FTP client expects the certificate or secure connection.
Enable "Allow both secure FTPS and non-secure FTP connections" option for the IP address under Plesk -> Tools & Settings -> IP Addresses -> 18.104.22.168 .