I was playing around last night attempting to disable Remote Access and was after some advice/observations.
I removed the port forward in my router and disabled Remote Access in Plex Web.
I have a SIM in my iPad so I disabled Wi-Fi and attempted to access my PMS via 4G and to my surprise I could still access and play content. I tried rebooting the NUC which hosts PMS.
I disabled Relay but looking at Dashboard it’s connecting remotely via IPv6. I have IPv6 enabled in my router. No IPv6 firewall rules are mapped to NUC in my ASUS router. I have IPv6 disabled in Plex Web and restarted PMS and now remote access is not possible.