FTP 200 Command OK vs 450 File Action Not Taken
FTP 200 (Command OK) is a 2xx Positive Completion response, while 450 (File Action Not Taken) 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, 450 means that requested file action not taken. The file is unavailable due to being busy, locked by another process, or temporarily inaccessible.
説明
The command has been successfully executed. This is a general acknowledgment that the command was understood and carried out.
このコードが表示される場合
After issuing any command that completes successfully, such as TYPE, MODE, or NOOP.
解決方法
No fix needed — the command succeeded. This is the standard positive response for commands that don't return data.
説明
Requested file action not taken. The file is unavailable due to being busy, locked by another process, or temporarily inaccessible.
このコードが表示される場合
When you try to access a file that is locked by another user or process, or when the server temporarily cannot process the file.
解決方法
Wait and retry the operation — the file may be locked by another transfer. If persistent, check server-side file locks and permissions.
主な違い
200 is a 2xx Positive Completion response, while 450 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 450: Requested file action not taken. The file is unavailable due to being busy, locked by another process, or temporarily inaccessible.
You encounter 200 when after issuing any command that completes successfully, such as TYPE, MODE, or NOOP.
You encounter 450 when when you try to access a file that is locked by another user or process, or when the server temporarily cannot process the file.
どちらをいつ使うか
For 200 (Command OK): No fix needed — the command succeeded. This is the standard positive response for commands that don't return data. For 450 (File Action Not Taken): Wait and retry the operation — the file may be locked by another transfer. If persistent, check server-side file locks and permissions.