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/var/log/secureand/var/log/auth.loglog SSH connections; a slave connection does not appear there because it piggybacks on an existing connection. If your ssh session allocates a terminal (i.e.ssh somehostwith no command supplied, orssh -t), that is (normally) logged inwtmp, regardless of how that terminal appeared (sshd whatever method was used to establish the connection, terminal emulator application, …).ControlPersist 600which is a delay in seconds of the socket being in idle before it gets automatically deleted. Otherwise it will close down automatically when the master connection ends. That's no good for executing a series of commands remotely (eg. a series of rsync commands to different folders)-S(specify socket) and-M(create master connection) of the SSH client.