RDP session with IGEL IZ1 RFX client to Microsoft Windows Server 2012/2012 R2 does not support RemoteFX 7 (Calista Codec) resulting in low session performance.
Problem
RemoteFX 7 (Calista Codec) is not active on the server.
Solution
Activate RemoteFX 7 (Calista Codec) on Microsoft Windows Server:
Change following parameters of your group policy (either local or as domain policy):
Go to Computer Configuration > Administrative Templates > Windows Components > Remote Desktop Services > Remote Desktop Session Host > Remote Session Environment
Enable Limit maximum Color Depth
Set Color Depth = Client Compatible
Enable RemoteFX encoding for RemoteFX client designed for Windows Server 2008 R2 SP1
In the thin client's setup (or UMS profile) enable Sessions > RDP > RDP Global > Performance > RemoteFX
Make sure your server provides sufficient amount of RAM.