FTP 150 File Status OK vs 225 Data Connection Open
FTP 150 (File Status OK) is a 1xx Positive Preliminary response, while 225 (Data Connection Open) is a 2xx Positive Completion response. 150 indicates that the file status is okay and the server is about to open the data connection for the transfer. This is the normal precursor to a file transfer. 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.
설명
The file status is okay and the server is about to open the data connection for the transfer. This is the normal precursor to a file transfer.
이 코드를 보게 되는 경우
Right before a file download or upload begins, confirming the file is accessible and the data channel is being opened.
해결 방법
No fix needed — this means the transfer is about to start. If the transfer stalls after this reply, check firewall rules blocking the data connection.
설명
Data connection open; no transfer in progress. The data channel is established and ready but no file transfer has started yet.
이 코드를 보게 되는 경우
When the data connection is established but idle, waiting for a transfer command to begin sending or receiving data.
해결 방법
No fix needed — the data connection is ready. Issue a RETR, STOR, or LIST command to start using it.
주요 차이점
150 is a 1xx Positive Preliminary response, while 225 is a 2xx Positive Completion response.
FTP 150: The file status is okay and the server is about to open the data connection for the transfer. This is the normal precursor to a file transfer.
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 150 when right before a file download or upload begins, confirming the file is accessible and the data channel is being opened.
You encounter 225 when when the data connection is established but idle, waiting for a transfer command to begin sending or receiving data.
언제 어떤 것을 사용할지
For 150 (File Status OK): No fix needed — this means the transfer is about to start. If the transfer stalls after this reply, check firewall rules blocking the data connection. For 225 (Data Connection Open): No fix needed — the data connection is ready. Issue a RETR, STOR, or LIST command to start using it.