How to configure an authoritative time server in Windows Server

To configure an internal time server to synchronize with an external time source, follow these steps: 

Open registry editor 

1. HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\W32Time\Parameters\Type = NTP

2. HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\W32Time\Config\AnnounceFlags = 5

3. HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\W32Time\TimeProviders\NtpServer\Enabled = 1

4. HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\W32Time\Parameters\NtpServer = some1.ntp.server,0x1 some2.ntp.server,0x1

5. HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\W32Time\TimeProviders\NtpClient\SpecialPollInterval = 900

6. HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\W32Time\Config\MaxPosPhaseCorrection = 72000 (decimal)

7. HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\W32Time\Config\MaxNegPhaseCorrection = 72000 (decimal)

Close Registry Editor.

At the command prompt, type the following command to restart the Windows Time service, and then press Enter: 

net stop w32time && net start w32time