Delete existing port forward rule in the router. Reboot the router.
Remove tick from manual port in Plex server remote access page. Disable remote access. Close Plex server.
Create new port forward rule in router for external port 45633, internal port 32400, TCP protocol, pointing to Plex server (static IP set either by DHCP reservation or by setting static IP in NIC/IPv4 properties). Apply port forward rule.
Enable remote access in Plex server, tick box for manual port and enter 45633. Click apply/retry. Close Plex server, restart Plex server.
This worked for me! What’s weird is I had the same access issue before and the issue was double-nat, which i was able to resolve with my internet provider and didn’t require any port forwarding in the router settings. This time (after calling my internet provider and making sure i was still not being double nat’d) following the about steps and creating a port forward resolved the issue!
Thanks for the easy to follow steps!