FTP 125 Data Connection Open vs 450 File Action Not Taken
FTP 125 (Data Connection Open) is a 1xx Positive Preliminary response, while 450 (File Action Not Taken) is a 4xx Transient Negative response. 125 indicates that the data connection is already open and the transfer is beginning. No need to open a new data connection. 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.
Mô tả
The data connection is already open and the transfer is beginning. No need to open a new data connection.
Khi bạn thấy mã này
When the server reuses an existing data connection for a file transfer instead of opening a new one.
Cách khắc phục
No fix needed — the transfer is starting immediately. Your client should begin reading or writing data on the existing connection.
Mô tả
Requested file action not taken. The file is unavailable due to being busy, locked by another process, or temporarily inaccessible.
Khi bạn thấy mã này
When you try to access a file that is locked by another user or process, or when the server temporarily cannot process the file.
Cách khắc phục
Wait and retry the operation — the file may be locked by another transfer. If persistent, check server-side file locks and permissions.
Sự khác biệt chính
125 is a 1xx Positive Preliminary response, while 450 is a 4xx Transient Negative response.
FTP 125: The data connection is already open and the transfer is beginning. No need to open a new data connection.
FTP 450: Requested file action not taken. The file is unavailable due to being busy, locked by another process, or temporarily inaccessible.
You encounter 125 when when the server reuses an existing data connection for a file transfer instead of opening a new one.
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.
Khi nào dùng cái nào
For 125 (Data Connection Open): No fix needed — the transfer is starting immediately. Your client should begin reading or writing data on the existing 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.