FTP 220 Service Ready vs 451 Local Error
FTP 220 (Service Ready) is a 2xx Positive Completion response, while 451 (Local Error) is a 4xx Transient 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, 451 means that requested action aborted: local error in processing. The server encountered an unexpected error while trying to complete the command.
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
Requested action aborted: local error in processing. The server encountered an unexpected error while trying to complete the command.
Cuándo lo verás
When the server has an internal issue like a disk I/O error, memory shortage, or filesystem problem during command processing.
Cómo solucionarlo
Retry the command. If the error persists, contact the server administrator to check disk health, available memory, and server logs.
Diferencias clave
220 is a 2xx Positive Completion response, while 451 is a 4xx Transient 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 451: Requested action aborted: local error in processing. The server encountered an unexpected error while trying to complete the command.
You encounter 220 when immediately upon connecting to an FTP server. This is the welcome banner confirming the server is accepting connections.
You encounter 451 when when the server has an internal issue like a disk I/O error, memory shortage, or filesystem problem during command processing.
Cuándo usar cada uno
For 220 (Service Ready): No fix needed — the server is ready. Proceed with USER and PASS commands to authenticate. For 451 (Local Error): Retry the command. If the error persists, contact the server administrator to check disk health, available memory, and server logs.