Setup DC for time sync to external NTP server.
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Configure NTP Time Sync Using Group Policy – TheITBros
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Configure NTP Time Sync Using Group Policy – TheITBros
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Managing Active Directory Time Synchronization on VMware vSphere - The things that are better left unspoken
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Force AD sync with Windows Server 2012 R2 domain - WinCert
Windows Server 2012 R2 : NTP Server : Server World
