FTP 150 File Status OK vs 450 File Action Not Taken
FTP 150 (File Status OK) is a 1xx Positive Preliminary response, while 450 (File Action Not Taken) is a 4xx Transient Negative 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, 450 means that requested file action not taken. The file is unavailable due to being busy, locked by another process, or temporarily inaccessible.
คำอธิบาย
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.
เมื่อคุณพบเห็น
Right before a file download or upload begins, confirming the file is accessible and the data channel is being opened.
วิธีแก้ไข
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.
คำอธิบาย
Requested file action not taken. The file is unavailable due to being busy, locked by another process, or temporarily inaccessible.
เมื่อคุณพบเห็น
When you try to access a file that is locked by another user or process, or when the server temporarily cannot process the file.
วิธีแก้ไข
Wait and retry the operation — the file may be locked by another transfer. If persistent, check server-side file locks and permissions.
ความแตกต่างหลัก
150 is a 1xx Positive Preliminary response, while 450 is a 4xx Transient Negative 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 450: Requested file action not taken. The file is unavailable due to being busy, locked by another process, or temporarily inaccessible.
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 450 when when you try to access a file that is locked by another user or process, or when the server temporarily cannot process the file.
ควรใช้อันไหนเมื่อไร
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 450 (File Action Not Taken): Wait and retry the operation — the file may be locked by another transfer. If persistent, check server-side file locks and permissions.