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503 FTP response code

A 503 response code may be sent in response to any command that requires the successful processing of previous commands first. It is a permanent negative reply, which means the client is discouraged from immediately sending the command again since the server will respond with the same reply code.

First published date

10/25/2018 7:35 PM

Last published date

10/25/2018 7:35 PM

Overview

This article provides information on 503 FTP response code.

Product section

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

Resolution

A 503 response code may be sent in response to any command that requires the successful processing of previous commands first. It is a permanent negative reply, which means the client is discouraged from immediately sending the command again since the server will respond with the same reply code. For example, a file rename requires a successful RNFR command before the RNTO command can be sent. Sending the RNTOcommand first will result in a 503 response code.

Example response 

503 Bad sequence of commands.

Possible commands