FTP 214 Help Message vs 425 Can't Open Data Connection
FTP 214 (Help Message) is a 2xx Positive Completion response, while 425 (Can't Open Data Connection) is a 4xx Transient Negative response. 214 indicates that help message. The server provides information about its implementation status, including a list of recognized commands or help for a specific command. In contrast, 425 means that can't open data connection. The server was unable to establish the data channel needed for the file transfer.
描述
Help message. The server provides information about its implementation status, including a list of recognized commands or help for a specific command.
何时出现
After issuing the HELP command. The server returns a list of supported commands or detailed usage for a specific command.
如何修复
No fix needed — this is an informational response. Use it to discover which commands the server supports.
描述
Can't open data connection. The server was unable to establish the data channel needed for the file transfer.
何时出现
When a firewall or NAT is blocking the data connection, or the client failed to connect to the server's passive port.
如何修复
Switch between active (PORT) and passive (PASV) modes. Check that your firewall allows the FTP data port range and that NAT is configured correctly.
主要区别
214 is a 2xx Positive Completion response, while 425 is a 4xx Transient Negative response.
FTP 214: Help message. The server provides information about its implementation status, including a list of recognized commands or help for a specific command.
FTP 425: Can't open data connection. The server was unable to establish the data channel needed for the file transfer.
You encounter 214 when after issuing the HELP command. The server returns a list of supported commands or detailed usage for a specific command.
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.
何时使用哪个
For 214 (Help Message): No fix needed — this is an informational response. Use it to discover which commands the server supports. 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.