FTP 202 Command Superfluous vs 450 File Action Not Taken
FTP 202 (Command Superfluous) is a 2xx Positive Completion response, while 450 (File Action Not Taken) is a 4xx Transient Negative response. 202 indicates that the command is not implemented but is recognized as superfluous. The server acknowledges the command but it has no effect. 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 is not implemented but is recognized as superfluous. The server acknowledges the command but it has no effect.
このコードが表示される場合
When you send a command the server recognizes but considers unnecessary, such as ALLO on a server that does not require pre-allocation.
解決方法
No fix needed — the server is telling you the command is not necessary. You can safely ignore this response and continue.
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
202 is a 2xx Positive Completion response, while 450 is a 4xx Transient Negative response.
FTP 202: The command is not implemented but is recognized as superfluous. The server acknowledges the command but it has no effect.
FTP 450: Requested file action not taken. The file is unavailable due to being busy, locked by another process, or temporarily inaccessible.
You encounter 202 when when you send a command the server recognizes but considers unnecessary, such as ALLO on a server that does not require pre-allocation.
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 202 (Command Superfluous): No fix needed — the server is telling you the command is not necessary. You can safely ignore this response and continue. 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.