Serviio automatically starts on OSX after the system boots. To disable this behaviour, follow these steps:

  - open the daemon configuration in your favorite editor: <code>/Library/LaunchDaemons/org.serviio.server.plist</code>
  - disable autostart by adding this element before the last </dict> element <code>
<key>Disabled</key>
<true/></code>
  - and save the file