550 FTP Reply Code - KB Article #1533Related Articles --
550 Requested action not taken; file unavailable.
A 550 reply code may be sent in response to any command requiring the server to access a local file. It is a permanent negative reply, which means the client is discouraged from sending the command again since the server will respond with the same reply code. It is usually due to a command requiring access to a file that does not exist or that the user does not have access rights to.