Add Site to Trusted Sites Zone with Group Policy

Internet Explorer has four Security zones (numbered 1-4) which are used by the Site to Zone Assignment List policy to associate sites to:

1. Intranet zone
2. Trusted Sites zone
3. Internet zone
4. Restricted Sites zone

To add a site to the Trusted Sites zone, do the following:

1. Create a new Group Policy Object (GPO) or edit a preexisting object
2. Navigate to Computer Configuration -> Administrative Templates -> Windows Components -> Internet Explorer -> Internet Control Panel -> Security Page
   
3. Select and open the “Site to Zone Assignment” List policy
4. Set the policy to Enabled
5. Click the “Show…” button
6. In the pop-up window, each row represents a domain (Value name) and zone (Value) pair. Enter the site name in the “Value Name” field and 2 (for Trusted Sites zone) in “Value” field
   
7. Click OK