FTP 215 System Type vs 503 Bad Sequence
FTP 215 (System Type) is a 2xx Positive Completion response, while 503 (Bad Sequence) is a 5xx Permanent Negative response. 215 indicates that the NAME system type, where NAME is an official system name from the list in the Assigned Numbers document. Reports the operating system of the server. In contrast, 503 means that bad sequence of commands. The command is valid but was sent in the wrong order relative to other commands.
説明
The NAME system type, where NAME is an official system name from the list in the Assigned Numbers document. Reports the operating system of the server.
このコードが表示される場合
After issuing the SYST command. The server reports its operating system type, commonly 'UNIX Type: L8' or 'Windows_NT'.
解決方法
No fix needed — use this information to adjust path separators and line endings for the server's OS type.
説明
Bad sequence of commands. The command is valid but was sent in the wrong order relative to other commands.
このコードが表示される場合
When you skip a required step, like sending PASS before USER, or RNTO without first sending RNFR.
解決方法
Follow the correct command sequence. Common sequences: USER then PASS for login, RNFR then RNTO for rename, PASV then RETR for transfer.
主な違い
215 is a 2xx Positive Completion response, while 503 is a 5xx Permanent Negative response.
FTP 215: The NAME system type, where NAME is an official system name from the list in the Assigned Numbers document. Reports the operating system of the server.
FTP 503: Bad sequence of commands. The command is valid but was sent in the wrong order relative to other commands.
You encounter 215 when after issuing the SYST command. The server reports its operating system type, commonly 'UNIX Type: L8' or 'Windows_NT'.
You encounter 503 when when you skip a required step, like sending PASS before USER, or RNTO without first sending RNFR.
どちらをいつ使うか
For 215 (System Type): No fix needed — use this information to adjust path separators and line endings for the server's OS type. 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.