FTP 213 File Status vs 503 Bad Sequence
FTP 213 (File Status) is a 2xx Positive Completion response, while 503 (Bad Sequence) is a 5xx Permanent Negative response. 213 indicates that file status reply. The server provides information about a specific file, typically its size or modification time. 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
File status reply. The server provides information about a specific file, typically its size or modification time.
何时出现
After issuing the SIZE or MDTM command, the server returns the file size in bytes or the last modification timestamp.
如何修复
No fix needed — this is an informational response. Use the returned data to determine file size before download or to check timestamps for synchronization.
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
213 is a 2xx Positive Completion response, while 503 is a 5xx Permanent Negative response.
FTP 213: File status reply. The server provides information about a specific file, typically its size or modification time.
FTP 503: Bad sequence of commands. The command is valid but was sent in the wrong order relative to other commands.
You encounter 213 when after issuing the SIZE or MDTM command, the server returns the file size in bytes or the last modification timestamp.
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 213 (File Status): No fix needed — this is an informational response. Use the returned data to determine file size before download or to check timestamps for synchronization. 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.