FTP 220 Service Ready vs 221 Closing Control Connection
Both FTP 220 (Service Ready) and 221 (Closing Control Connection) belong to the 2xx Positive Completion category. 220 indicates that service ready for new user. This is the greeting message sent by the FTP server when a client first connects. Meanwhile, 221 means that service closing control connection. The server is logging out and closing the session in response to a QUIT command.
설명
Service ready for new user. This is the greeting message sent by the FTP server when a client first connects.
이 코드를 보게 되는 경우
Immediately upon connecting to an FTP server. This is the welcome banner confirming the server is accepting connections.
해결 방법
No fix needed — the server is ready. Proceed with USER and PASS commands to authenticate.
설명
Service closing control connection. The server is logging out and closing the session in response to a QUIT command.
이 코드를 보게 되는 경우
After issuing the QUIT command to gracefully disconnect from the FTP server.
해결 방법
No fix needed — the session has ended normally. Reconnect with a new session if needed.
주요 차이점
FTP 220: Service ready for new user. This is the greeting message sent by the FTP server when a client first connects.
FTP 221: Service closing control connection. The server is logging out and closing the session in response to a QUIT command.
You encounter 220 when immediately upon connecting to an FTP server. This is the welcome banner confirming the server is accepting connections.
You encounter 221 when after issuing the QUIT command to gracefully disconnect from the FTP server.
언제 어떤 것을 사용할지
For 220 (Service Ready): No fix needed — the server is ready. Proceed with USER and PASS commands to authenticate. For 221 (Closing Control Connection): No fix needed — the session has ended normally. Reconnect with a new session if needed.