FTP 202 Command Superfluous vs 451 Local Error
FTP 202 (Command Superfluous) is a 2xx Positive Completion response, while 451 (Local Error) is a 4xx Transient Negative response. 202 indicates that the command is not implemented but is recognized as superfluous. The server acknowledges the command but it has no effect. In contrast, 451 means that requested action aborted: local error in processing. The server encountered an unexpected error while trying to complete the command.
Description
The command is not implemented but is recognized as superfluous. The server acknowledges the command but it has no effect.
Quand vous le voyez
When you send a command the server recognizes but considers unnecessary, such as ALLO on a server that does not require pre-allocation.
Comment résoudre
No fix needed — the server is telling you the command is not necessary. You can safely ignore this response and continue.
Description
Requested action aborted: local error in processing. The server encountered an unexpected error while trying to complete the command.
Quand vous le voyez
When the server has an internal issue like a disk I/O error, memory shortage, or filesystem problem during command processing.
Comment résoudre
Retry the command. If the error persists, contact the server administrator to check disk health, available memory, and server logs.
Différences clés
202 is a 2xx Positive Completion response, while 451 is a 4xx Transient Negative response.
FTP 202: The command is not implemented but is recognized as superfluous. The server acknowledges the command but it has no effect.
FTP 451: Requested action aborted: local error in processing. The server encountered an unexpected error while trying to complete the command.
You encounter 202 when when you send a command the server recognizes but considers unnecessary, such as ALLO on a server that does not require pre-allocation.
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.
Quand utiliser lequel
For 202 (Command Superfluous): No fix needed — the server is telling you the command is not necessary. You can safely ignore this response and continue. For 451 (Local Error): Retry the command. If the error persists, contact the server administrator to check disk health, available memory, and server logs.