FTP 110 Restart Marker Reply vs 500 Syntax Error
FTP 110 (Restart Marker Reply) is a 1xx Positive Preliminary response, while 500 (Syntax Error) 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, 500 means that syntax error, command unrecognized. The server could not parse the command. This may also be sent when the command line is too long.
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, command unrecognized. The server could not parse the command. This may also be sent when the command line is too long.
このコードが表示される場合
When you send a malformed or misspelled command, or a command the server does not recognize at all.
解決方法
Check the command spelling and syntax. Use HELP to see the list of supported commands on this server.
主な違い
110 is a 1xx Positive Preliminary response, while 500 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 500: Syntax error, command unrecognized. The server could not parse the command. This may also be sent when the command line is too long.
You encounter 110 when during a resumed file transfer when the server confirms the restart position in the data stream.
You encounter 500 when when you send a malformed or misspelled command, or a command the server does not recognize at all.
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 500 (Syntax Error): Check the command spelling and syntax. Use HELP to see the list of supported commands on this server.