5.1 Calendar Server push not working

After updating to OS X 10.11.4 and Server 5.1 (from 10.11.3) the Calendar server won't push updates to users. I see no error messages, and don’t really know which log to look for them.

The correct ports in the router is open. I’ve tried restarting the mac, deleting Server.app and reinstall from App Store. Push notifications are enabled.

Push works in Profile Manager, pushing settings to my iPhone.

The same update and Calendar push notifications works fine on another clients server.

Any suggestions?

🙂

Asbjørn