FTP 211 System Status vs 450 File Action Not Taken
FTP 211 (System Status) is a 2xx Positive Completion response, while 450 (File Action Not Taken) is a 4xx Transient Negative response. 211 indicates that system status or system help reply. The server provides information about its current status or available features. 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.
描述
System status or system help reply. The server provides information about its current status or available features.
何时出现
After issuing the STAT command without arguments, the server returns its system status and supported features.
如何修复
No fix needed — this is an informational response. Use the information to understand the server's capabilities and current state.
描述
Requested file action not taken. The file is unavailable due to being busy, locked by another process, or temporarily inaccessible.
何时出现
When you try to access a file that is locked by another user or process, or when the server temporarily cannot process the file.
如何修复
Wait and retry the operation — the file may be locked by another transfer. If persistent, check server-side file locks and permissions.
主要区别
211 is a 2xx Positive Completion response, while 450 is a 4xx Transient Negative response.
FTP 211: System status or system help reply. The server provides information about its current status or available features.
FTP 450: Requested file action not taken. The file is unavailable due to being busy, locked by another process, or temporarily inaccessible.
You encounter 211 when after issuing the STAT command without arguments, the server returns its system status and supported features.
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.
何时使用哪个
For 211 (System Status): No fix needed — this is an informational response. Use the information to understand the server's capabilities and current state. 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.