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List of FTP server return codes

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FTP server return codes always have three digits, and each digit has a special meaning. The first digit denotes whether the response is good, bad or incomplete:

RangePurpose
`1xx`Positive Preliminary reply
`2xx`Positive Completion reply
`3xx`Positive Intermediate reply
`4xx`Transient Negative Completion reply
`5xx`Permanent Negative Completion reply
`6xx`Protected reply

The second digit is a grouping digit and encodes the following information:

RangePurpose
`x0x`Syntax
`x1x`Information
`x2x`Connections
`x3x`Authentication and accounting
`x4x`Unspecified as of RFC 959.
`x5x`File system

Below is a list of all known return codes that may be issued by an FTP server.

CodeExplanation
`100 Series`The requested action is being initiated, expect another reply before proceeding with a new command.
`110`Restart marker replay . In this case, the text is exact and not left to the particular implementation; it must read: `MARK yyyy = mmmm` where yyyy is User-process data stream marker, and mmmm server's equivalent marker (note the spaces between markers and "=").
`120`Service ready in nnn minutes.
`125`Data connection already open; transfer starting.
`150`File status okay; about to open data connection.
`200 Series`The requested action has been successfully completed.
`202`Command not implemented, superfluous at this site.
`211`System status, or system help reply.
`212`Directory status.
`213`File status.
`214`Help message. Explains 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 from the registry kept by IANA.
`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).
`228`Entering Long Passive Mode (long address, port).
`229`Entering Extended Passive Mode (
`230`User logged in, proceed.
`232`User logged in, authorized by security data exchange.
`234`Server accepts the security mechanism specified by the client; no security data needs to be exchanged.
`235`Server accepts the security data given by the client; no further security data needs to be exchanged.
`250`Requested file action was okay, completed.
`300 Series`The command is not acceptable, but the requested action is on hold, pending receipt of further information.
`331`User name okay, password needed.
`332`No need account for login.
`334`Server accepts the security mechanism specified by the client; some security data needs to be exchanged.
`335`Server accepts the security data given by the client; more security data needs to be exchanged.
`336`Username okay, password okay. Challenge is "....".
`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.
`430`Invalid username or password
`431`Need some unavailable resource to process security.
`434`Requested host unavailable.
`450`Requested file action not taken.
`451`Requested action aborted. Local error in processing.
`452`Requested action not taken. Insufficient storage space in system. File unavailable (e.g., file busy).
`500 Series`Syntax error, command unrecognized and the requested action did not take place. 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.
`533`Command protection level denied for policy reasons.
`534`Request denied for policy reasons.
`535`Failed security check.
`536`Data protection level not supported by security mechanism.
`537`Command protection level not supported by security mechanism.
`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.
`600 Series`Replies regarding confidentiality and integrity
`631`Integrity protected reply.
`632`Confidentiality and integrity protected reply.
`633`Confidentiality protected reply.

References

References

  1. [https://datatracker.ietf.org/doc/html/rfc959 RFC 959 File Transfer Protocol]
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