FTP 200 Command OK vs 451 Local Error
FTP 200 (Command OK) is a 2xx Positive Completion response, while 451 (Local Error) is a 4xx Transient Negative response. 200 indicates that the command has been successfully executed. This is a general acknowledgment that the command was understood and carried out. In contrast, 451 means that requested action aborted: local error in processing. The server encountered an unexpected error while trying to complete the command.
설명
The command has been successfully executed. This is a general acknowledgment that the command was understood and carried out.
이 코드를 보게 되는 경우
After issuing any command that completes successfully, such as TYPE, MODE, or NOOP.
해결 방법
No fix needed — the command succeeded. This is the standard positive response for commands that don't return data.
설명
Requested action aborted: local error in processing. The server encountered an unexpected error while trying to complete the command.
이 코드를 보게 되는 경우
When the server has an internal issue like a disk I/O error, memory shortage, or filesystem problem during command processing.
해결 방법
Retry the command. If the error persists, contact the server administrator to check disk health, available memory, and server logs.
주요 차이점
200 is a 2xx Positive Completion response, while 451 is a 4xx Transient Negative response.
FTP 200: The command has been successfully executed. This is a general acknowledgment that the command was understood and carried out.
FTP 451: Requested action aborted: local error in processing. The server encountered an unexpected error while trying to complete the command.
You encounter 200 when after issuing any command that completes successfully, such as TYPE, MODE, or NOOP.
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.
언제 어떤 것을 사용할지
For 200 (Command OK): No fix needed — the command succeeded. This is the standard positive response for commands that don't return data. For 451 (Local Error): Retry the command. If the error persists, contact the server administrator to check disk health, available memory, and server logs.