FTP 214 Help Message vs 503 Bad Sequence
FTP 214 (Help Message) is a 2xx Positive Completion response, while 503 (Bad Sequence) 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, 503 means that bad sequence of commands. The command is valid but was sent in the wrong order relative to other commands.
描述
Help message. The server provides information about its implementation status, including a list of recognized commands or help for a specific command.
何时出现
After issuing the HELP command. The server returns a list of supported commands or detailed usage for a specific command.
如何修复
No fix needed — this is an informational response. Use it to discover which commands the server supports.
描述
Bad sequence of commands. The command is valid but was sent in the wrong order relative to other commands.
何时出现
When you skip a required step, like sending PASS before USER, or RNTO without first sending RNFR.
如何修复
Follow the correct command sequence. Common sequences: USER then PASS for login, RNFR then RNTO for rename, PASV then RETR for transfer.
主要区别
214 is a 2xx Positive Completion response, while 503 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 503: Bad sequence of commands. The command is valid but was sent in the wrong order relative to other commands.
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 503 when when you skip a required step, like sending PASS before USER, or RNTO without first sending RNFR.
何时使用哪个
For 214 (Help Message): No fix needed — this is an informational response. Use it to discover which commands the server supports. For 503 (Bad Sequence): Follow the correct command sequence. Common sequences: USER then PASS for login, RNFR then RNTO for rename, PASV then RETR for transfer.