Plex Web App Port. Hover the mouse over the poster on the item details screen and click related page. Specific nas devices may offer other ways to launch plex web app. Enable forwarding on your router to the appropriate ip address and port;
Navigate to settings > server > transcoder to access the server settings. Disable plex authentication on your local network.
If your plex server connects to the web through a slower connection like dsl, it may be a good idea to change the quality of your video stream.
Open the plex web application and make sure that your plex account is signed in under: To open the plex web app from a different device than the server computer. When i press plex app on local connection,. Im assuming that the plex media server web interface (ip:32400 or whatever it is) uses a virtual server in apache2 or nginx ect.