FTP 215 System Type vs 504 Parameter Not Implemented
FTP 215 (System Type) is a 2xx Positive Completion response, while 504 (Parameter Not Implemented) 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, 504 means that command not implemented for that parameter. The command is supported but not with the specific parameter value provided.
Description
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.
When You See It
After issuing the SYST command. The server reports its operating system type, commonly 'UNIX Type: L8' or 'Windows_NT'.
How to Fix
No fix needed — use this information to adjust path separators and line endings for the server's OS type.
Description
Command not implemented for that parameter. The command is supported but not with the specific parameter value provided.
When You See It
When you use an unsupported transfer type or mode, such as TYPE E (EBCDIC) on a server that only supports ASCII and binary.
How to Fix
Use a supported parameter value. Check the server documentation or use FEAT to see which parameter options are available.
Key Differences
215 is a 2xx Positive Completion response, while 504 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 504: Command not implemented for that parameter. The command is supported but not with the specific parameter value provided.
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 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.
When to Use Which
For 215 (System Type): No fix needed — use this information to adjust path separators and line endings for the server's OS type. For 504 (Parameter Not Implemented): Use a supported parameter value. Check the server documentation or use FEAT to see which parameter options are available.