UltraVNC

Authentication for Administrators Group was problems:
I do as below:
Add Administrators group into UltraVNC/Security/Windows Authentication but when UltraVNCviewer connect it cannot authenticate.

Create a group named UltraVNC then add UltraVNC group into UltraVNC/Security/Windows Authentication ...

What is the best practice if I want to install Untra VNC 1.8.x.x via GPO in Active Directory?
I'm thinking about this way.
Step 1: Setup a good UltraVNC Server manually.
Step 2: Install via GPO for another PC.
Step 3: Copy file C:\ProgramData\UltraVNC\ultravnc.ini which installed in Step1 to another ...