Limiting websites users can go to

I'm upgrading Windows Server 2003 servers running Internet Explorer 8 to Windows Server 2008 R2 running Internet Explorer 11.  Each server hosts about 20 thin clients, and there's only 2 websites that I want the users of these thin clients to be able to go to, namely adp.com and our company's website.  In Server 2003 running Internet Explorer 8 I accomplished this by adding "*.adp.com" to the trusted sites group and by adding a similar entry for our company's website, however Internet Explorer 11 won't let me add our company's website to the trusted sites group because it is not https (it is http).  How can I configure these servers running Windows Server 2008 R2 and Internet Explorer 11 so that the users can only go to two websites, one of them being an http website?
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Declan_BasileITAsked:
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David Johnson, CD, MVPOwnerCommented:
Edit it here
Windows Components/Internet Explorer/Internet Control Panel/Security
Site to Zone Assignment List” , click “Enable” and edit the list. Add the site and the number two for Trusted Site. (1 = Intranet, 2 = trusted sites, 3 = Internet Zone and 4 = Restricted Site Zone.
http://blogs.msdn.com/b/microsoft_press/archive/2014/04/14/from-the-mvps-setting-internet-explorer-trusted-site-settings-via-group-policy-object-in-windows-server-2012-r2.aspx

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Declan_BasileITAuthor Commented:
I tried specifying a trusted website this way, and when I restarted the computer I can see that the change had an effect because the list of trusted websites was greyed out.  However, 1.) it did not show me what trusted websites I specified in group policy of the domain controller (note: the list was blank when I looked in internet options), 2.) when going to the website it had restrictions as if it weren't in the trusted sites zone, and 3.) when I looked in the local group policy of the computer those options/settings weren't there (note: I think this has something to do with the settings being retrieved from the central store instead of the local "c:\windows\policy definitions" because the local folder has inetres.admx which I believe contains these settings).  How can I troubleshoot why this didn't work?
David Johnson, CD, MVPOwnerCommented:
.adm/.admx's are only used for editing the actually policy in the {GUID} folders.
Declan_BasileITAuthor Commented:
I ended up specifying the trusted websites in a mandatory profile.  Thanks for letting me know the location in group policy where this is set.
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