FTP 110 Restart Marker Reply vs 550 File Unavailable
FTP 110 (Restart Marker Reply) is a 1xx Positive Preliminary response, while 550 (File Unavailable) 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, 550 means that requested action not taken. File unavailable — the file does not exist, the path is wrong, or you do not have permission to access it.
Description
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.
Quand vous le voyez
During a resumed file transfer when the server confirms the restart position in the data stream.
Comment résoudre
No fix needed — this is a normal response during transfer recovery. If restarts keep failing, verify the marker format matches what your client expects.
Description
Requested action not taken. File unavailable — the file does not exist, the path is wrong, or you do not have permission to access it.
Quand vous le voyez
When you try to download, delete, or navigate to a file or directory that does not exist or is restricted by server permissions.
Comment résoudre
Verify the file path and name are correct (FTP paths are case-sensitive on most servers). Check your user permissions with the server administrator.
Différences clés
110 is a 1xx Positive Preliminary response, while 550 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 550: Requested action not taken. File unavailable — the file does not exist, the path is wrong, or you do not have permission to access it.
You encounter 110 when during a resumed file transfer when the server confirms the restart position in the data stream.
You encounter 550 when when you try to download, delete, or navigate to a file or directory that does not exist or is restricted by server permissions.
Quand utiliser lequel
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 550 (File Unavailable): Verify the file path and name are correct (FTP paths are case-sensitive on most servers). Check your user permissions with the server administrator.