FTP Replies

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In the protocol conversation between an FTP client (such as WS_FTP Pro) and an FTP server, at least one server reply is sent to the FTP client in response to an FTP command. A reply consists of a three-digit code, followed by one line of text, and terminated by the Telnet end-of-line code.

Positive Preliminary Replies

These types of replies indicate that the requested action was taken and that another reply is to follow.

110 Restart marker reply.
120 Service ready in nnn minutes.
125 Data connection already open; transfer starting.
150 File status okay; about to open data connection.

Positive Completion Replies

These type of replies indicate that the requested action was taken and
that the server is awaiting another command.

200 Command okay.
202 Command not implemented, superfluous at this site.
211 System status, or system help reply.
212 Directory status.
213 File status.
214 Help message on how to use the server or the meaning of a particular non-standard command. This reply is useful only to the human user.
215 NAME system type. Where NAME is an official system name.
220 Service ready for new user.
221 Service closing control connection. Logged out if appropriate.
225 Data connection open; no transfer in progress.
226 Closing data connection. Requested file action successful
(for example, file transfer or file abort).
227 Entering Passive Mode (h1,h2,h3,h4,p1,p2).
230 User logged in, proceed.
250 Requested file action okay, completed.
257 "PATHNAME" created.

Positive Intermediate Replies

These types of replies indicate that the requested action was taken and that the server is awaiting further information to complete the request.

331 User name okay, need password.
332 Need account for login.
350 Requested file action pending further information.

Transient Negative Completion Replies

These types of replies indicate that the command was not accepted; the requested action was not taken. However, the error is temporary and the action may be requested again.

421 Service not available, closing control connection. This may be a reply to any command if the service knows it must shut down.
425 Can't open data connection.
426 Connection closed; transfer aborted.
450 Requested file action not taken. File unavailable (e.g., file busy).
451 Requested action aborted: local error in processing.
452 Requested action not taken. Insufficient storage space in system.

Permanent Negative Completion Replies

These types of replies indicate that the command was not accepted; the requested action was not taken. The FTP client is "discouraged" from repeating the same exact request.

500 Syntax error, command unrecognized. This may include errors such as command line too long.
501 Syntax error in parameters or arguments.
502 Command not implemented.
503 Bad sequence of commands.
504 Command not implemented for that parameter.
530 Not logged in.
532 Need account for storing files.
550 Requested action not taken. File unavailable; e.g., file not found,
no access.
551 Requested action aborted: page type unknown.
552 Requested file action aborted. Exceeded storage allocation for current directory or dataset.
553 Requested action not taken. File name not allowed.

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