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Table Of Contents  The TCP/IP Guide
 9  TCP/IP Application Layer Protocols, Services and Applications (OSI Layers 5, 6 and 7)
      9  TCP/IP Key Applications and Application Protocols
           9  TCP/IP File and Message Transfer Applications and Protocols (FTP, TFTP, Electronic Mail, USENET, HTTP/WWW, Gopher)
                9  TCP/IP General File Transfer Protocols (FTP and TFTP)
                     9  File Transfer Protocol (FTP)
                          9  FTP Commands and Replies

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FTP Internal Protocol Commands and Command Groups
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FTP User Interface and User Commands
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FTP Replies, Reply Code Format and Important Reply Codes
(Page 4 of 5)

Common FTP Reply Codes

Table 230 contains a list of some of the more common FTP reply codes taken from RFC 959. They are shown in numerical order, along with the reply text given as typical in that document, and additional descriptive information from myself where needed:

Table 230: FTP Reply Codes

Reply Code

Typical Reply Text



Restart marker reply.

Used as part of the marker restart feature when transferring in block mode.


Service ready in “nnn” minutes.

“nnn” indicates the number of minutes until the service will be available.


Data connection already open; transfer starting.



File status okay; about to open data connection.



Command okay.

Sometimes the text indicates the name of the command that was successful.


Command not implemented, or superfluous at this site.



System status, or system help reply.

Will contain system-specific status or help information.


Directory status.



File status.



Help message.

Includes help information of use to a human user of this server.


“NAME” system type.

“NAME” is the name of a type of operating system. Often sent as a reply to the SYST command.


Service ready for new user.

Sent when the command channel is established before the USER command is sent.


Service closing control connection.

A “goodbye” message sent when the session is closed.


Data connection open; no transfer in progress.



Closing data connection.

Sent after a successful file transfer or a file abort.


Entering Passive Mode (h1,h2,h3,h4,p1,p2).

Sent in reply to the PASV command, indicates the IP address and port to use for the data connection.


User logged in, proceed.

Sent after successful USER and PASS authentication. Systems often include additional “greeting” or other information with this code after a login.


Requested file action okay, completed.

The text description will provide more details about what was successfully done, such as confirming a change of directory or deleted file.


“PATHNAME” created.

“PATHNAME” is replaced by the path created.


User name okay, need password.

Intermediate result after sending USER but before sending PASS.


Need account for login.



Requested file action pending further information.



Service not available, closing control connection.

Sometimes sent if the FTP server is in the process of shutting down.


Can't open data connection.



Connection closed; transfer aborted.



Requested file action not taken. File unavailable.

The file is not available; for example, it may be locked by another user. Contrast to reply code 550.


Requested action aborted: local error in processing.



Requested action not taken. Insufficient storage space in system.

The file system is full.


Syntax error, command unrecognized.

Bad or excessively long command line was sent.


Syntax error in parameters or arguments.



Command not implemented.



Bad sequence of commands.



Command not implemented for that parameter.



Not logged in.

Sent if authentication fails due to a bad user name or incorrect password.


Requested action not taken. File unavailable.

File was not found or user does not have access to it. This error code may be sent in reply to any file transfer command if the user has not successfully logged in yet. Contrast to reply code 450.


Requested action aborted: page type unknown.



Requested file action aborted. Exceeded storage allocation.



Requested action not taken. File name not allowed.


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