ftp response codes

When analyzing network traces, sessions, or logs, you’ll see the following codes used within FTP transactions. Knowing what they mean can be very helpful in figuring out what is happening.

code meaning
110 Restart marker reply
120 Service ready in (n) minutes
125 Data connection already open, transfer starting
150 File status okay, about to open data connection
200 Command okay
202 Command not implemented
211 System status, or system help reply
212 Directory status
213 File status
214 Help message
215 NAME system type
220 Service ready for new user
221 Service closing control connection
225 Data connection open, no transfer in progress
226 Closing data connection. Requested file action successful
227 Entering Passive Mode
230 User logged in, proceed
250 Requested file action okay, completed
257 PATHNAME created
331 Username okay, need password
332 Need account for login
350 Requested file action pending further information
421 Service not available, closing control connection
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
501 Syntax error in parameters or arguments
502 Command not implemented
503 Bad sequence of commands
504 Command not implemented for that parameter
530 User not logged in
532 Need account for storing files
550 Requested action not taken. File unavailable-or-I/O Error: Socket Closed
552 Requested file action aborted, storage allocation exceeded
553 Requested action not taken. Illegal file name

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