FTP 125 Data Connection Open vs 221 Closing Control Connection
FTP 125 (Data Connection Open) is a 1xx Positive Preliminary response, while 221 (Closing Control Connection) is a 2xx Positive Completion response. 125 indicates that the data connection is already open and the transfer is beginning. No need to open a new data connection. In contrast, 221 means that service closing control connection. The server is logging out and closing the session in response to a QUIT command.
Deskripsi
The data connection is already open and the transfer is beginning. No need to open a new data connection.
Ketika Anda Melihatnya
When the server reuses an existing data connection for a file transfer instead of opening a new one.
Cara Memperbaiki
No fix needed — the transfer is starting immediately. Your client should begin reading or writing data on the existing connection.
Deskripsi
Service closing control connection. The server is logging out and closing the session in response to a QUIT command.
Ketika Anda Melihatnya
After issuing the QUIT command to gracefully disconnect from the FTP server.
Cara Memperbaiki
No fix needed — the session has ended normally. Reconnect with a new session if needed.
Perbedaan Utama
125 is a 1xx Positive Preliminary response, while 221 is a 2xx Positive Completion response.
FTP 125: The data connection is already open and the transfer is beginning. No need to open a new data connection.
FTP 221: Service closing control connection. The server is logging out and closing the session in response to a QUIT command.
You encounter 125 when when the server reuses an existing data connection for a file transfer instead of opening a new one.
You encounter 221 when after issuing the QUIT command to gracefully disconnect from the FTP server.
Kapan Menggunakan Yang Mana
For 125 (Data Connection Open): No fix needed — the transfer is starting immediately. Your client should begin reading or writing data on the existing connection. For 221 (Closing Control Connection): No fix needed — the session has ended normally. Reconnect with a new session if needed.