Problem with connecting nComputing L300 to Multipoint Server 2012

I have the following setup:

Windows MultiPoint Server 2012 Premium connected to domain controller Windows Server 2003 R2 Enterprise Edition (running active directory).

On WMS 2012 I installed vSpace Server software v. 7.1.3

When I want to login in AD from nComputing station L300 this message comes up: "Requested Session Access is Denied"

I followed this guide http://www.ncomputing.com/kb/NComputing-vSpace-Server-Console-Guide_312.html but no success.

First error message when i tried to connect to AD was this: "To log on to this remote computer, you must be granted the Allow log on.." but I was able to fix it the following way http://www.ncomputing.com/kb/To-log-on-to-this-remote-computer-you-must-be-granted-the-Allow-log-on_243.html.

My goal is restricting of users through GPO.