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 con-
nection 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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