- 110 Restart marker reply. 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 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 from the list in the Assigned Numbers document.
- 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.
- 331 User name okay, need password.
- 332 Need account for login.
- 350 Requested file action pending further information.
- 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.
- 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.