How to close guest access in Plex Media Server?

Question

Information Security

Good afternoon!
I've been using Plex Media Server for a long time, I recently decided to upgrade. I install via docker: timhaak/plex.
At the same time, when I moved it to a new version, the server became visible on the Internet. Moreover, it is freely visible, no logins and passwords are required - just go to the page and do what you want. At the same time, you act as if you are the administrator of this server.
Am I dumb and can't cut off guest access (which doesn't seem to be there at all) or did they mess up somewhere?

Answer 1

In general, I figured it out ...
There is a config - Preferences.xml
If there is a disableRemoteSecurity="1" variable, then access will be available to everyone. If you set the value to 0, access will be by login and password.