FreeBSD by default prints the system logs to TTY and console, so you can infer certain information just by connecting a monitor to the system, or by observing the console output.

To avoid this behavior and leave the TTY clean of information, it is necessary to edit the configuration file of the syslog daemon. To do this we edit /etc/syslog.conf and comment out the line that indicates what type of messages will be displayed to the console.

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Once commented this line and restarted the daemon, we will have a clean TTY of information that can become critical.