100 - The requested action is being initiated, expect another reply before proceeding with a new command.
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.
200 - The requested action has been successfully completed.
200 - Command okay.
202 - Command not implemented, superflous at this site.
211 - System status, or system help reply.
212 - Directory status.
213 - File status.
214 - Help message.
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
230 - User logged in, proceed.
250 - Requested file action okay, completed.
257 - "PATHNAME" created.
300 - The command has been accepted, but the requested action is being held in abeyance, pending receipt of further information.
331 - User name okay, need password.
332 - Need account for login.
350 - Requested file action pending further information.
400 - The command was not accepted and the requested action did not take place, but the error condition 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.
500 - Series Codes: The command was not accepted and the requested action did not take place.
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).
552 - Requested file action aborted. Exceeded storage allocation (for current directory or dataset).
553 - Requested action not taken. File name not allowed.