No access to Plex server and or Interface

Port 32600 is used internally by PMS.

The full list of ports used by Plex for LAN are here.

https://support.plex.tv/articles/201543147-what-network-ports-do-i-need-to-allow-through-my-firewall/

For Remote Access, the only port you’re concerned about is host port 32400/TCP
Port forwarding from the router redirects the wan port (whatever it may be) to SERVER_IP:32400