Assume that you have a Windows Server 2012 or Windows Server 2012 R2-based computer that was configured to advertise as a time server. After you do an in-place upgrade on the computer to install Windows Server 2016 Version 1607, the computer is no longer advertised as a time server.

Resolution

To resolve this issue, follow these steps:

1. Start Registry Editor.
2. Locate the following registry subkey:
   
   HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\W32Time\TimeProviders\NtpServer
3. Set the DWORD value of Enabled to 1.
4. Open an elevated Command Prompt window, and then run the following command: 
   net start w32time

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Quelle: Microsoft