FTP 110 Restart Marker Reply vs 225 Data Connection Open
FTP 110 (Restart Marker Reply) is a 1xx Positive Preliminary response, while 225 (Data Connection Open) is a 2xx Positive Completion 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, 225 means that data connection open; no transfer in progress. The data channel is established and ready but no file transfer has started yet.
คำอธิบาย
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.
เมื่อคุณพบเห็น
During a resumed file transfer when the server confirms the restart position in the data stream.
วิธีแก้ไข
No fix needed — this is a normal response during transfer recovery. If restarts keep failing, verify the marker format matches what your client expects.
คำอธิบาย
Data connection open; no transfer in progress. The data channel is established and ready but no file transfer has started yet.
เมื่อคุณพบเห็น
When the data connection is established but idle, waiting for a transfer command to begin sending or receiving data.
วิธีแก้ไข
No fix needed — the data connection is ready. Issue a RETR, STOR, or LIST command to start using it.
ความแตกต่างหลัก
110 is a 1xx Positive Preliminary response, while 225 is a 2xx Positive Completion 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 225: Data connection open; no transfer in progress. The data channel is established and ready but no file transfer has started yet.
You encounter 110 when during a resumed file transfer when the server confirms the restart position in the data stream.
You encounter 225 when when the data connection is established but idle, waiting for a transfer command to begin sending or receiving data.
ควรใช้อันไหนเมื่อไร
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 225 (Data Connection Open): No fix needed — the data connection is ready. Issue a RETR, STOR, or LIST command to start using it.