Specifies the keepalive time value in milliseconds.
Keepalive packets are sent between the monitor and the
remote server as a mechanism to ensure the TCP session
is active and detect session failure in a timely manner.
During periods of idle monitor traffic, the monitor will
send a keepalive packet to the remote server at the
specified interval. The monitor also expects to receive
a keepalive packet from the remote server at the same
interval. If the monitor does not receive a
keepalive packet from the remote server in two times the
keep alive value, the monitor will close the TCP
session. The value of zero disables the keep alive
processing.