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536 FTP response code

A 536 response code may be sent in response to a PROT command when the requested protection level is unsupported by the current security mechanism. It is a permanent negative response, which means the client is discouraged from sending the command again since the server will respond with the same response code.

First published date

11/14/2018 3:17 PM

Last published date

11/14/2018 3:17 PM

Overview

This article provides information on 536 FTP response code.

Product section

Serv-U Managed File Transfer & Serv-U FTP Server

Resolution

A 536 response code may be sent in response to a PROT command when the requested protection level is unsupported by the current security mechanism. It is a permanent negative response, which means the client is discouraged from sending the command again since the server will respond with the same response code. Negotiating a different security mechanism using the AUTH command can result in a different response code.

Example response

536 Requested PROT level not supported by mechanism.

Possible command

PROT FTP command