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.
Description
The data connection is already open and the transfer is beginning. No need to open a new data connection.
When You See It
When the server reuses an existing data connection for a file transfer instead of opening a new one.
How to Fix
No fix needed — the transfer is starting immediately. Your client should begin reading or writing data on the existing connection.
Description
System status or system help reply. The server provides information about its current status or available features.
When You See It
After issuing the STAT command without arguments, the server returns its system status and supported features.
How to Fix
No fix needed — this is an informational response. Use the information to understand the server's capabilities and current state.
Key Differences
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.
When to Use Which
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.