FTP 220 Service Ready vs 504 Parameter Not Implemented
FTP 220 (Service Ready) is a 2xx Positive Completion response, while 504 (Parameter Not Implemented) is a 5xx Permanent Negative response. 220 indicates that service ready for new user. This is the greeting message sent by the FTP server when a client first connects. In contrast, 504 means that command not implemented for that parameter. The command is supported but not with the specific parameter value provided.
Descripción
Service ready for new user. This is the greeting message sent by the FTP server when a client first connects.
Cuándo lo verás
Immediately upon connecting to an FTP server. This is the welcome banner confirming the server is accepting connections.
Cómo solucionarlo
No fix needed — the server is ready. Proceed with USER and PASS commands to authenticate.
Descripción
Command not implemented for that parameter. The command is supported but not with the specific parameter value provided.
Cuándo lo verás
When you use an unsupported transfer type or mode, such as TYPE E (EBCDIC) on a server that only supports ASCII and binary.
Cómo solucionarlo
Use a supported parameter value. Check the server documentation or use FEAT to see which parameter options are available.
Diferencias clave
220 is a 2xx Positive Completion response, while 504 is a 5xx Permanent Negative response.
FTP 220: Service ready for new user. This is the greeting message sent by the FTP server when a client first connects.
FTP 504: Command not implemented for that parameter. The command is supported but not with the specific parameter value provided.
You encounter 220 when immediately upon connecting to an FTP server. This is the welcome banner confirming the server is accepting connections.
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.
Cuándo usar cada uno
For 220 (Service Ready): No fix needed — the server is ready. Proceed with USER and PASS commands to authenticate. For 504 (Parameter Not Implemented): Use a supported parameter value. Check the server documentation or use FEAT to see which parameter options are available.