Sonos can no longer be used after updating Synology-NAS

[fraubi]

After updating the firmware of my Synology-NAS to DSM 6.1.3-15152-5 Update 5, the Subsonic-Server is running, but the Sonos-App can't connect to Subsonic anymore.
So the SONOS-Function of Subsonic can no longer be used.

Hope for an update of Subsonic.

Fraubi