This didn&#x27;t exist in 2000.  It was created and made default on the server in OpenSSH 5.  OpenSSH 5 did not make it into enterprise distros for quite some time.<p>There are literally tens of thousands of articles telling folks to enable ControlMaster (Multiplexing) on the client to &quot;make ssh faster&quot;.  You would be hard pressed to find a devops shop that isn&#x27;t already using ControlMaster in their ssh client config.  There are at least a handful of government and financial sites that set MaxSessions to 1 because they understand the risk.