FTP 212 Directory Status vs 551 Page Type Unknown
FTP 212 (Directory Status) is a 2xx Positive Completion response, while 551 (Page Type Unknown) is a 5xx Permanent Negative response. 212 indicates that directory status reply. The server provides information about the current directory or a specified directory. In contrast, 551 means that requested action aborted: page type unknown. The server does not recognize the requested page structure or format.
説明
Directory status reply. The server provides information about the current directory or a specified directory.
このコードが表示される場合
After issuing the STAT command on a directory, the server returns the directory listing or status information.
解決方法
No fix needed — this is an informational response showing directory contents or status.
説明
Requested action aborted: page type unknown. The server does not recognize the requested page structure or format.
このコードが表示される場合
When attempting a transfer with a page structure type the server does not support. This is extremely rare in modern FTP usage.
解決方法
Switch to stream transfer mode (MODE S) and file structure (STRU F), which are universally supported by all FTP servers.
主な違い
212 is a 2xx Positive Completion response, while 551 is a 5xx Permanent Negative response.
FTP 212: Directory status reply. The server provides information about the current directory or a specified directory.
FTP 551: Requested action aborted: page type unknown. The server does not recognize the requested page structure or format.
You encounter 212 when after issuing the STAT command on a directory, the server returns the directory listing or status information.
You encounter 551 when when attempting a transfer with a page structure type the server does not support. This is extremely rare in modern FTP usage.
どちらをいつ使うか
For 212 (Directory Status): No fix needed — this is an informational response showing directory contents or status. For 551 (Page Type Unknown): Switch to stream transfer mode (MODE S) and file structure (STRU F), which are universally supported by all FTP servers.