If all else fails, switch to DHCP to have the router assign the NAS an IP. Double check manual IP assignment to ensure all numbers match (and the IP address you reserved for the NAS is actually available and offered by the router). Should you be unable to access the Plex server on the network as well as outside the home or office, you may have a misconfiguration of your NAS, which may include discrepancies between the router or access point and the unit. How to enable remote access in Plex (opens in new tab) Cannot access server on LAN This is the required port you need to have open but others can be added (opens in new tab) for additional Plex services like DLNA. How to forward ports on a router differs between manufacturers but the details you need to know are as follows:

Or you can go down the manual route by opening up a port yourself.

Universal Plug and Play (uPnP) can be enabled to allow Plex to 'talk' with the router and have ports and routes opened up for access from the outside world. If you're able to access the Plex server using a client on the same network but are unable to connect outside, the most likely cause of the problem is the router.

Plex media server update library