Not available outside OR inside my network

For some super strange reason Plex can't even find out the IP of the computer I'm on, nevermind my router or modem, etc. I do have port forwarding set up, but it doesn't matter, because this is as far as it gets: https://lh3.googleusercontent.com/-pwCxt669s1I/V1pqyFp9h1I/AAAAAAAAKqs/6yDTSjpib-M/s0/firefox_2016-06-10_00-22-47.png

I can access stuff on my local computer using it, but not elsewhere on my home network or the internet.