Problems with Karmaba3Dgetlicense from Zoo Server

Hi we are using Zooserver 6 SR21 , Rhino 6.0 and Karamba3D.

Through testing everything works fine, but when we started our courses with 20 Students - they where not able to get a License from Karamba3D.

On Zooserver i see the PCname and username and that Rhino and KAramba license is signed to the user. But on the client there comes an error when we start “Karamba3dgetlicense” : “Can not initialize license properly.”

So if we do this many times it works after 1-7 tries sometimes never.
Please help us.

Info: we installed one machine with all our software and then we made an image from it. with this image all the other Computers were generated.

Dear @p.brandstaetter,

are you using the 1.3.3 version of Karamba. Did the license activate successfully on the initial machine?