For those of you with your own local DNS resolvers (those which impact DNS Rebinding Protection), the optimal solution is to create a rule which allows plex.direct without disabling DNS Rebinding Protection as a whole.
Most DNS solutions, as well as many ISP modem/routers, have such settings
Below is how it is implemented on PfSense
What this does is to allow Private Domain “plex.direct” to be created for the local LAN segment.
This type of custom configuration is only necessary if the PMS DEBUG logs show errors resolving plex.direct naming between server and client(s).
… and now we return to your normal player beta testing 
