Bad sequence of commands
Service closing control connection
Closing data connection, requested file action successful
Command not implemented
Syntax error, command unrecognized
Not part of the FTP standard, generated by SFML when the low-level socket connection is unexpectedly closed
Not part of the FTP standard, generated by SFML when the low-level socket connection with the server fails
Data connection already opened, transfer starting
Data connection open, no transfer in progress
Can't open data connection
PATHNAME created
Directory status
Entering passive mode
Requested file action not taken
Requested file action ok
Requested action not taken, file name not allowed
File status
Requested action not taken, file unavailable
Help message
Requested action not taken; insufficient storage space in system, file unavailable
Not part of the FTP standard, generated by SFML when a local file cannot be read or written
Not part of the FTP standard, generated by SFML when a received response cannot be parsed
Requested action aborted, local error in processing
User logged in, proceed. Logged out if appropriate
Need account for login
Need account for storing files
Requested file action pending further information
User name ok, need password
Requested file action aborted, exceeded storage allocation
Not logged in
Command ok
File status ok, about to open data connection
Requested action aborted, page type unknown
Command not implemented for that parameter
Syntax error in parameters or arguments
Command not implemented
Restart marker reply
Service ready for new user
Service ready in N minutes
Service not available, closing control connection
System status, or system help reply
NAME system type, where NAME is an official system name from the list in the Assigned Numbers document
Connection closed, transfer aborted
FTP 服务端响应码和客户端错误码。