Dru Lavigne says, for this reason, you’ll note that, unlike most security tutorials, this article will not address changing any of the permissions on your FreeBSD system. This is intentional. Unless you’re securing a production server and you know what you’re doing, never change the permissions of any file. (If you must practice with permissions, stick to the files in your home directory). Otherwise, things might stop working; things you might miss like email, X Window System, sound. Strange things will happen at strange times, making it harder to clue in that they are related to the permission setting you played with a week ago Tuesday. Read more.