OK the upgrade of the backline Servers are finished :-)

One SQLAnywhere-DB at SLES11SP4; 3 primary server as appliance.
The WkStn. are being upgraded at the moment (~400 pending, 50 ready)

But there is a problem with the refresh of the WkStn.

Each time the refresh occurs the ZEN-Agent shows a Message that it has
lost the Connection to the ZEN server and can not reauthentificate.
After this the ZEN-Programstarter window is empty.

This is at new and old Agents.

Any hints?