Article ID: 124791, created on Mar 11, 2015, last review on Mar 11, 2015

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


Cannot connect to FTP server, the following error is shown:

Command:    LIST
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 ->

Search Words

Failed to retrieve directory listing

534-Protection level negotiation failed

Protection negotiation failed

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