For a WINDOWS server you can also use this method: You need to reclaim your server, but don't dare to touch the Windows Registry
It avoids editing the registry directly.
For claiming the server afterwards, I had success with this method:
- Stop Plex server
- make the changes to the registry, either by editing it directly, or use the reg file from the above link
- sign in to your plex account by going to plex.tv, “Sign In” (as opposed to “Sign Up”)
- start Plex server using the regular Windows Start menu (unless you are running it as a system service, but if you do, you should already know how to start it)
- now double click the
Setup Plex.htmlfile inside your Plex data folder - the web browser might now show an endless spinner. Let it sit spinning for at least 5 minutes!
- Stop Plex server using its task tray icon
- reboot Windows
- Wait another 5 minutes, then open the plex web app and see if access is restored
Don’t forget that you need to revisit all your client apps and other tools which are accessing your server using an access token.