FTP 150 File Status OK vs 425 Can't Open Data Connection
FTP 150 (File Status OK) is a 1xx Positive Preliminary response, while 425 (Can't Open Data Connection) is a 4xx Transient Negative response. 150 indicates that the file status is okay and the server is about to open the data connection for the transfer. This is the normal precursor to a file transfer. 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
The file status is okay and the server is about to open the data connection for the transfer. This is the normal precursor to a file transfer.
何时出现
Right before a file download or upload begins, confirming the file is accessible and the data channel is being opened.
如何修复
No fix needed — this means the transfer is about to start. If the transfer stalls after this reply, check firewall rules blocking the data connection.
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
150 is a 1xx Positive Preliminary response, while 425 is a 4xx Transient Negative response.
FTP 150: The file status is okay and the server is about to open the data connection for the transfer. This is the normal precursor to a file transfer.
FTP 425: Can't open data connection. The server was unable to establish the data channel needed for the file transfer.
You encounter 150 when right before a file download or upload begins, confirming the file is accessible and the data channel is being opened.
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 150 (File Status OK): No fix needed — this means the transfer is about to start. If the transfer stalls after this reply, check firewall rules blocking the data connection. 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.