Ex. 設定ssh Client 一小時內沒動作就disconnect
ClientAliveInterval 1800
ClientAliveCountMax 0
sshd_config man page
ClientAliveCountMax
Sets the number of client alive messages (see below) which may be
sent without sshd 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.
ClientAliveInterval
Sets a timeout interval in seconds after which if no data has been
received from the client, sshd 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. This option applies to protocol version 2 only.
