Mai jos, cele mai comune coduri de răspuns FTP și semnificația lor:
1xx – Răspuns preliminar
- 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
2xx – Acțiune finalizată cu succes
- 200 Command okay
- 202 Command not implemented
- 211 System status / help reply
- 212 Directory status
- 213 File status
- 214 Help message
- 220 Service ready for new user
- 221 Service closing control connection
- 226 Closing data connection; file action successful
- 227 Entering Passive Mode
- 230 User logged in, proceed
- 250 Requested file action okay, completed
- 257 „PATHNAME” created
3xx – Necesită informații suplimentare
- 331 User name okay, need password
- 332 Need account for login
- 350 Requested file action pending further information
4xx – Eroare temporară
- 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 busy)
- 451 Requested action aborted; local error
- 452 Insufficient storage space
5xx – Eroare permanentă
- 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 File unavailable (not found / no access)
- 552 Storage allocation exceeded
- 553 Illegal file name
