sshd超时断开配置
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配置文件：/etc/ssh/sshd_config
ClientAliveInterval
Sets a timeout interval in seconds
after which if no data has been received from the client, sshd(8) will
send a message through the encrypted channel
to request a
response from the client. The default is 0, indicating that these
messages will not be sent to the client.
ClientAliveCountMax
Sets the number of client alive messages (see below) which may be sent without sshd(8) receiving any messages back from the client. If this threshold
is reached while client alive messages are being sent, sshd will disconnect the client, terminating the session. It is important to note that the use
of client alive messages is very different from TCPKeepAlive (below). The client alive messages are sent through the encrypted channel and therefore
will not be spoofable. The TCP keepalive option enabled by TCPKeepAlive is spoofable. The client alive mechanism is valuable when the client or server
depend on knowing when a connection has become inactive.
The default value is 3. If ClientAliveInterval (see below) is set to 15, and ClientAliveCountMax is left at the default, unresponsive SSH clients will
be disconnected after approximately 45 seconds.
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