FTP 211 System Status vs 504 Parameter Not Implemented
FTP 211 (System Status) is a 2xx Positive Completion response, while 504 (Parameter Not Implemented) 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, 504 means that command not implemented for that parameter. The command is supported but not with the specific parameter value provided.
描述
System status or system help reply. The server provides information about its current status or available features.
何时出现
After issuing the STAT command without arguments, the server returns its system status and supported features.
如何修复
No fix needed — this is an informational response. Use the information to understand the server's capabilities and current state.
描述
Command not implemented for that parameter. The command is supported but not with the specific parameter value provided.
何时出现
When you use an unsupported transfer type or mode, such as TYPE E (EBCDIC) on a server that only supports ASCII and binary.
如何修复
Use a supported parameter value. Check the server documentation or use FEAT to see which parameter options are available.
主要区别
211 is a 2xx Positive Completion response, while 504 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 504: Command not implemented for that parameter. The command is supported but not with the specific parameter value provided.
You encounter 211 when after issuing the STAT command without arguments, the server returns its system status and supported features.
You encounter 504 when when you use an unsupported transfer type or mode, such as TYPE E (EBCDIC) on a server that only supports ASCII and binary.
何时使用哪个
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 504 (Parameter Not Implemented): Use a supported parameter value. Check the server documentation or use FEAT to see which parameter options are available.