FTP 110 Restart Marker Reply vs 221 Closing Control Connection
FTP 110 (Restart Marker Reply) is a 1xx Positive Preliminary response, while 221 (Closing Control Connection) is a 2xx Positive Completion response. 110 indicates that the server is sending a restart marker reply. The text is exact and not left to interpretation. This marker is used to indicate the point at which a file transfer should be restarted. In contrast, 221 means that service closing control connection. The server is logging out and closing the session in response to a QUIT command.
Descrição
The server is sending a restart marker reply. The text is exact and not left to interpretation. This marker is used to indicate the point at which a file transfer should be restarted.
Quando você o vê
During a resumed file transfer when the server confirms the restart position in the data stream.
Como corrigir
No fix needed — this is a normal response during transfer recovery. If restarts keep failing, verify the marker format matches what your client expects.
Descrição
Service closing control connection. The server is logging out and closing the session in response to a QUIT command.
Quando você o vê
After issuing the QUIT command to gracefully disconnect from the FTP server.
Como corrigir
No fix needed — the session has ended normally. Reconnect with a new session if needed.
Diferenças principais
110 is a 1xx Positive Preliminary response, while 221 is a 2xx Positive Completion response.
FTP 110: The server is sending a restart marker reply. The text is exact and not left to interpretation. This marker is used to indicate the point at which a file transfer should be restarted.
FTP 221: Service closing control connection. The server is logging out and closing the session in response to a QUIT command.
You encounter 110 when during a resumed file transfer when the server confirms the restart position in the data stream.
You encounter 221 when after issuing the QUIT command to gracefully disconnect from the FTP server.
Quando usar qual
For 110 (Restart Marker Reply): No fix needed — this is a normal response during transfer recovery. If restarts keep failing, verify the marker format matches what your client expects. For 221 (Closing Control Connection): No fix needed — the session has ended normally. Reconnect with a new session if needed.