Plex Web App can't find server

Hello,

I followed this guide to install Plex on Fedora:
http://bendavis.me/2015/03/29/setup-plex-media-server-on-fedora/

Then I disabled firewalld because for some reason even though I added port 32400/tcp, it still didn't allow connections to the web app. Now I can connect to the webapp but it can't find my server. Why could this be? They should be afaik both running on the same machine. I just did
sudo systemctl start plexmediaserver

I expect that should have started everything.