So the problem i am having when i go to canyouseeme.org,
the IP address there is not match with my router WAN IP and i have router come modem sullied from my ISP.
So you saying I need to request static Ip from ISP?
Also do I still need to set up static up for pc through router as it running the Plex media server and directly connected with modem/router via Ethernet.!?
I recently switched to a new ISP that has CGNAT. This solved my problem:
You need to setup a VPS with an external IP that listens to the plex requests. GCP offers a micro instance virtually for free that can be used for this.