FTP 125 Data Connection Open vs 211 System Status
FTP 125 (Data Connection Open) is a 1xx Positive Preliminary response, while 211 (System Status) 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, 211 means that system status or system help reply. The server provides information about its current status or available features.
描述
The data connection is already open and the transfer is beginning. No need to open a new data connection.
何时出现
When the server reuses an existing data connection for a file transfer instead of opening a new one.
如何修复
No fix needed — the transfer is starting immediately. Your client should begin reading or writing data on the existing connection.
描述
System status or system help reply. The server provides information about its current status or available features.
何时出现
After issuing the STAT command without arguments, the server returns its system status and supported features.
如何修复
No fix needed — this is an informational response. Use the information to understand the server's capabilities and current state.
主要区别
125 is a 1xx Positive Preliminary response, while 211 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 211: System status or system help reply. The server provides information about its current status or available features.
You encounter 125 when when the server reuses an existing data connection for a file transfer instead of opening a new one.
You encounter 211 when after issuing the STAT command without arguments, the server returns its system status and supported features.
何时使用哪个
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 211 (System Status): No fix needed — this is an informational response. Use the information to understand the server's capabilities and current state.