534-Protection level negotiation failed

Refers to:

  • Plesk 11.5 for Windows
  • Plesk 12.0 for Windows

Created:

2016-11-16 13:19:30 UTC

Modified:

2017-02-15 10:17:40 UTC

1

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534-Protection level negotiation failed

Symptoms

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

Cause

FTP client expects the certificate or secure connection.

Resolution

Enable "Allow both secure FTPS and non-secure FTP connections" option for the IP address under Plesk -> Tools & Settings -> IP Addresses -> 1.2.3.4 .

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