Note that even though the FTP server had automatically closed the connection after 60 seconds on inactivity, the client will only be informed when it tries to execute a command after the timeout.
注意，即使FTP服务器已经在保持60秒不活动之后自动关闭了连接，但是客户要在超时之后尝试执行命令时才会被通知。
The 'show stat' command will record semaphore timeout information.
“show stat”命令将报告信号量超时信息。
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