NVIDIA Shield - remote access

Plex Docs
Server SettingsRemote Access
Remote Access & Server Sharing

Plex Forum Tips & TricksThe Basics of Remote Access Troubleshooting

External IP Address: Blank/All
Internal IP Address: IP address of the Plex Media Server
Protocol: TCP
Internal Port: Always 32400
External Port: 32400 is default. Change if desired. Must match Manually specify public port in Plex server Remote Access settings.

Example: Asus RT-AC68U