KeepAlive 5 at the global level of httpd.conf allows the server to handle 5 requests on a connection before forcing the connection closed.
conf全局级的KeepAlive5允许服务器在连接强制关闭之前处理一个连接上的5个请求。
Now after inactivity for 60 seconds, we get a connection closed message from the remote machine, which indicates that the auto logoff is successfully set for SSH.
现在，在60秒的不活跃之后，我们从远程机器收到一条连接关闭消息，这表示已经为SSH成功设置了自动下线。
No operations allowed after connection closed.
连接关闭后不允许再执行操作。
Connection closed by foreign host.
连接已被外部主机关闭。
Connection closed by foreign host.
连接已被外部主机关闭。
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