FTP 214 Help Message vs 551 Page Type Unknown
FTP 214 (Help Message) is a 2xx Positive Completion response, while 551 (Page Type Unknown) is a 5xx Permanent Negative response. 214 indicates that help message. The server provides information about its implementation status, including a list of recognized commands or help for a specific command. In contrast, 551 means that requested action aborted: page type unknown. The server does not recognize the requested page structure or format.
คำอธิบาย
Help message. The server provides information about its implementation status, including a list of recognized commands or help for a specific command.
เมื่อคุณพบเห็น
After issuing the HELP command. The server returns a list of supported commands or detailed usage for a specific command.
วิธีแก้ไข
No fix needed — this is an informational response. Use it to discover which commands the server supports.
คำอธิบาย
Requested action aborted: page type unknown. The server does not recognize the requested page structure or format.
เมื่อคุณพบเห็น
When attempting a transfer with a page structure type the server does not support. This is extremely rare in modern FTP usage.
วิธีแก้ไข
Switch to stream transfer mode (MODE S) and file structure (STRU F), which are universally supported by all FTP servers.
ความแตกต่างหลัก
214 is a 2xx Positive Completion response, while 551 is a 5xx Permanent Negative response.
FTP 214: Help message. The server provides information about its implementation status, including a list of recognized commands or help for a specific command.
FTP 551: Requested action aborted: page type unknown. The server does not recognize the requested page structure or format.
You encounter 214 when after issuing the HELP command. The server returns a list of supported commands or detailed usage for a specific command.
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.
ควรใช้อันไหนเมื่อไร
For 214 (Help Message): No fix needed — this is an informational response. Use it to discover which commands the server supports. 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.