Anybody? Any suggestions?
I can't see any obvious reason why the Host Sample should not run on a Windows Server platform.
Did you make sure, there is no firewall rule blocking port 5084 (LLRP)?
As an alternative you may want to try the open source LLRP toolkit ( llrp.org )
However the LLRP toolkit in general does need more lines of code and EMDK is easier to implement.