Enable PIN for Web even when not signed in.

I added a PIN to my seedbox that’s running plex. When I am signed into my plex it asks for my info/PIN when I goto the IP. It asks for my info on my ROKU’s, but when I am NOT logged into plex, and goto the server on chrome, it doesn’t ask for a pin and just loads the home screen. It looks like anyone with that IP could log on and make changes or view content. How am I able to add a PIN, or COMPLETELY disable access unless someone is signed in?