after upgrade from 14.04 to 16.04 the akonadi open-xchange resource doesn't synchronise

After the upgrade from kubuntu 14.04 to 16.04, the akonadi open-xchange resource doesn't synchronise calender and contacts. It's happen on my desktop pc and also on my notebook. I did remove the open-xchange resource and tried to add them again. Effect,
1.) I cannot find any open-xchange resource after them at contact or calender module
2.) At the akonadiconsole, I can see at the agents tab the open-xchange agent, but at the browser tab, cannot find anything from open-xchange.

lsb_release -rd
Description: Ubuntu 16.04.1 LTS
Release: 16.04

apt-cache policy akonadi-server
akonadi-server:
  Installiert: 4:15.12.3-0ubuntu6
  Installationskandidat: 4:15.12.3-0ubuntu6
  Versionstabelle:
 *** 4:15.12.3-0ubuntu6 500
        500 http://archive.ubuntu.com/ubuntu xenial/universe amd64 Packages
        100 /var/lib/dpkg/status

I have one kubuntu 14.04 installation left, there the akonadi open-xchange agent working fine.