Exchange Synch no communication

[Saesch]

hi

we have Exchange Synch Server which works very good with different devices most are Samsung with Android.

Now i have a User with a Sony Xperia Z2 (Modell D6503, Build 23.0.1.A.0.167, Android 4.4.4) that doesnt even

communicate with our Synch-Server trough the Microsoft Active-Sync. i dont see anything from this device in the Log of the Synch-Server. I tried with internal WLAN but also over normal Mobile-Network, where the Server is accessible.

Tried several accounts after reboot and disabling all Security Features...

i dont know how or where to search for a solution. any hints ? are there known bug-fixes in this version ?

Thanks

[MagnusNordstrom]

I get "For MyCompany it demands that you update security settings". I removed tha account and put it back and it worked again but only some days. Now the same message again. Looks like a bug? for Android 4.4.4