Remote access settings for IPv6 on Synology NAS and Router

It’s not actually a server ID, it’s a certificate UUID; how you find it depends up the host on which you run your Plex Media Server:

  • Windows - In Regedit, navigate to HKEY_CURRENT_USER\SOFTWARE\Plex, Inc.\Plex Media Server and find the value of CertificateUUID.
  • macOS - Run defaults read com.plexapp.plexmediaserver CertificateUUID.
  • Linux - Find your Preferences.xml file in your Plex data directory and locate the CertificateUUID parameter within.
  • NAS - Generally found in your Preferences.xml. Where it’s located depends on the NAS.
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