FTP 110 Restart Marker Reply vs 501 Syntax Error in Arguments
FTP 110 (Restart Marker Reply) is a 1xx Positive Preliminary response, while 501 (Syntax Error in Arguments) is a 5xx Permanent Negative response. 110 indicates that the server is sending a restart marker reply. The text is exact and not left to interpretation. This marker is used to indicate the point at which a file transfer should be restarted. In contrast, 501 means that syntax error in parameters or arguments. The command was recognized but its arguments are invalid or malformed.
説明
The server is sending a restart marker reply. The text is exact and not left to interpretation. This marker is used to indicate the point at which a file transfer should be restarted.
このコードが表示される場合
During a resumed file transfer when the server confirms the restart position in the data stream.
解決方法
No fix needed — this is a normal response during transfer recovery. If restarts keep failing, verify the marker format matches what your client expects.
説明
Syntax error in parameters or arguments. The command was recognized but its arguments are invalid or malformed.
このコードが表示される場合
When you use a valid command but with wrong parameters, such as an invalid path format or incorrect argument count.
解決方法
Review the command's required argument format. Common issues include missing quotes around paths with spaces or invalid character encoding.
主な違い
110 is a 1xx Positive Preliminary response, while 501 is a 5xx Permanent Negative response.
FTP 110: The server is sending a restart marker reply. The text is exact and not left to interpretation. This marker is used to indicate the point at which a file transfer should be restarted.
FTP 501: Syntax error in parameters or arguments. The command was recognized but its arguments are invalid or malformed.
You encounter 110 when during a resumed file transfer when the server confirms the restart position in the data stream.
You encounter 501 when when you use a valid command but with wrong parameters, such as an invalid path format or incorrect argument count.
どちらをいつ使うか
For 110 (Restart Marker Reply): No fix needed — this is a normal response during transfer recovery. If restarts keep failing, verify the marker format matches what your client expects. For 501 (Syntax Error in Arguments): Review the command's required argument format. Common issues include missing quotes around paths with spaces or invalid character encoding.