FTP 211 System Status vs 503 Bad Sequence
FTP 211 (System Status) is a 2xx Positive Completion response, while 503 (Bad Sequence) is a 5xx Permanent Negative response. 211 indicates that system status or system help reply. The server provides information about its current status or available features. In contrast, 503 means that bad sequence of commands. The command is valid but was sent in the wrong order relative to other commands.
Descripción
System status or system help reply. The server provides information about its current status or available features.
Cuándo lo verás
After issuing the STAT command without arguments, the server returns its system status and supported features.
Cómo solucionarlo
No fix needed — this is an informational response. Use the information to understand the server's capabilities and current state.
Descripción
Bad sequence of commands. The command is valid but was sent in the wrong order relative to other commands.
Cuándo lo verás
When you skip a required step, like sending PASS before USER, or RNTO without first sending RNFR.
Cómo solucionarlo
Follow the correct command sequence. Common sequences: USER then PASS for login, RNFR then RNTO for rename, PASV then RETR for transfer.
Diferencias clave
211 is a 2xx Positive Completion response, while 503 is a 5xx Permanent Negative response.
FTP 211: System status or system help reply. The server provides information about its current status or available features.
FTP 503: Bad sequence of commands. The command is valid but was sent in the wrong order relative to other commands.
You encounter 211 when after issuing the STAT command without arguments, the server returns its system status and supported features.
You encounter 503 when when you skip a required step, like sending PASS before USER, or RNTO without first sending RNFR.
Cuándo usar cada uno
For 211 (System Status): No fix needed — this is an informational response. Use the information to understand the server's capabilities and current state. 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.