/usr/lib/firewalld/services/ Current File: //usr/lib/firewalld/services/spotify-sync.xml

<?xml version="1.0" encoding="utf-8"?>
<service>
  <short>Spotify Client Sync</short>
  <description>The Spotify Client allows you to sync local music files with your phone.</description>
  <port port="57621" protocol="udp"/>
  <port port="57621" protocol="tcp"/>
</service>