FTP 125 Data Connection Open vs 451 Local Error
FTP 125 (Data Connection Open) is a 1xx Positive Preliminary response, while 451 (Local Error) is a 4xx Transient Negative 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, 451 means that requested action aborted: local error in processing. The server encountered an unexpected error while trying to complete the command.
विवरण
The data connection is already open and the transfer is beginning. No need to open a new data connection.
जब आप इसे देखें
When the server reuses an existing data connection for a file transfer instead of opening a new one.
कैसे ठीक करें
No fix needed — the transfer is starting immediately. Your client should begin reading or writing data on the existing connection.
विवरण
Requested action aborted: local error in processing. The server encountered an unexpected error while trying to complete the command.
जब आप इसे देखें
When the server has an internal issue like a disk I/O error, memory shortage, or filesystem problem during command processing.
कैसे ठीक करें
Retry the command. If the error persists, contact the server administrator to check disk health, available memory, and server logs.
मुख्य अंतर
125 is a 1xx Positive Preliminary response, while 451 is a 4xx Transient Negative response.
FTP 125: The data connection is already open and the transfer is beginning. No need to open a new data connection.
FTP 451: Requested action aborted: local error in processing. The server encountered an unexpected error while trying to complete the command.
You encounter 125 when when the server reuses an existing data connection for a file transfer instead of opening a new one.
You encounter 451 when when the server has an internal issue like a disk I/O error, memory shortage, or filesystem problem during command processing.
कब किसका उपयोग करें
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 451 (Local Error): Retry the command. If the error persists, contact the server administrator to check disk health, available memory, and server logs.