FTP 200 Command OK vs 425 Can't Open Data Connection
FTP 200 (Command OK) is a 2xx Positive Completion response, while 425 (Can't Open Data Connection) is a 4xx Transient Negative response. 200 indicates that the command has been successfully executed. This is a general acknowledgment that the command was understood and carried out. In contrast, 425 means that can't open data connection. The server was unable to establish the data channel needed for the file transfer.
설명
The command has been successfully executed. This is a general acknowledgment that the command was understood and carried out.
이 코드를 보게 되는 경우
After issuing any command that completes successfully, such as TYPE, MODE, or NOOP.
해결 방법
No fix needed — the command succeeded. This is the standard positive response for commands that don't return data.
설명
Can't open data connection. The server was unable to establish the data channel needed for the file transfer.
이 코드를 보게 되는 경우
When a firewall or NAT is blocking the data connection, or the client failed to connect to the server's passive port.
해결 방법
Switch between active (PORT) and passive (PASV) modes. Check that your firewall allows the FTP data port range and that NAT is configured correctly.
주요 차이점
200 is a 2xx Positive Completion response, while 425 is a 4xx Transient Negative response.
FTP 200: The command has been successfully executed. This is a general acknowledgment that the command was understood and carried out.
FTP 425: Can't open data connection. The server was unable to establish the data channel needed for the file transfer.
You encounter 200 when after issuing any command that completes successfully, such as TYPE, MODE, or NOOP.
You encounter 425 when when a firewall or NAT is blocking the data connection, or the client failed to connect to the server's passive port.
언제 어떤 것을 사용할지
For 200 (Command OK): No fix needed — the command succeeded. This is the standard positive response for commands that don't return data. For 425 (Can't Open Data Connection): Switch between active (PORT) and passive (PASV) modes. Check that your firewall allows the FTP data port range and that NAT is configured correctly.