FTP 110 Restart Marker Reply vs 553 File Name Not Allowed
FTP 110 (Restart Marker Reply) is a 1xx Positive Preliminary response, while 553 (File Name Not Allowed) 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, 553 means that requested action not taken. File name not allowed. The file or directory name violates the server's naming rules or filesystem restrictions.
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.
When You See It
During a resumed file transfer when the server confirms the restart position in the data stream.
How to Fix
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 name not allowed. The file or directory name violates the server's naming rules or filesystem restrictions.
When You See It
When you try to create or rename a file with characters the server's filesystem does not allow, such as special characters or reserved names.
How to Fix
Rename the file to use only allowed characters. Avoid special characters like ?, *, |, <, >, and leading/trailing spaces or dots.
Key Differences
110 is a 1xx Positive Preliminary response, while 553 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 553: Requested action not taken. File name not allowed. The file or directory name violates the server's naming rules or filesystem restrictions.
You encounter 110 when during a resumed file transfer when the server confirms the restart position in the data stream.
You encounter 553 when when you try to create or rename a file with characters the server's filesystem does not allow, such as special characters or reserved names.
When to Use Which
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 553 (File Name Not Allowed): Rename the file to use only allowed characters. Avoid special characters like ?, *, |, <, >, and leading/trailing spaces or dots.