FTP 202 Command Superfluous vs 221 Closing Control Connection
Both FTP 202 (Command Superfluous) and 221 (Closing Control Connection) belong to the 2xx Positive Completion category. 202 indicates that the command is not implemented but is recognized as superfluous. The server acknowledges the command but it has no effect. Meanwhile, 221 means that service closing control connection. The server is logging out and closing the session in response to a QUIT command.
描述
The command is not implemented but is recognized as superfluous. The server acknowledges the command but it has no effect.
何时出现
When you send a command the server recognizes but considers unnecessary, such as ALLO on a server that does not require pre-allocation.
如何修复
No fix needed — the server is telling you the command is not necessary. You can safely ignore this response and continue.
描述
Service closing control connection. The server is logging out and closing the session in response to a QUIT command.
何时出现
After issuing the QUIT command to gracefully disconnect from the FTP server.
如何修复
No fix needed — the session has ended normally. Reconnect with a new session if needed.
主要区别
FTP 202: The command is not implemented but is recognized as superfluous. The server acknowledges the command but it has no effect.
FTP 221: Service closing control connection. The server is logging out and closing the session in response to a QUIT command.
You encounter 202 when when you send a command the server recognizes but considers unnecessary, such as ALLO on a server that does not require pre-allocation.
You encounter 221 when after issuing the QUIT command to gracefully disconnect from the FTP server.
何时使用哪个
For 202 (Command Superfluous): No fix needed — the server is telling you the command is not necessary. You can safely ignore this response and continue. For 221 (Closing Control Connection): No fix needed — the session has ended normally. Reconnect with a new session if needed.