3-STEP!! CONFIGURING NTP SERVER ON WINDOWS SERVER 2019

Step 1. "Enabled NtpServer"

1.1  Windows+R. In the Run window, type “service.msc” into the search box, and then hit Enter

  And right-click on ‘Windows Time’ and select "Stop" 

1.2  Windows+R. In the Run window, type “regedit” into the search box, and then hit Enter

1.3 Navigate to the path shown below:

HKEY_LOCAL_MACHINE \ System \ CurrentControlSet \ Services \ W32Time \ TimeProviders \ NtpServer 

And Click (left click) on “Modify” Set the Value data to 1 and click OK.

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Step 2.  "Announce Flags"

2.1  Navigate to the path shown below:

Computer>HKEY_LOCAL_MACHINE>SYSTEM>CurrentControlSet>Services>W32Time>Config

At the right pane locate the ‘Announce Flags’ file.

And Click (left click) on “Modify” Set the Value data to 5 and click OK.

2.2  And Back to Service page.

reboot the NTP server for the changes to take place. Head back to the services Window, right-click on ‘Windows Time’ and select "Start"

Step 3.  Open UDP port 123 in Firewall

3.1 Click on the “Inbound Rule” button on the top left section and 

Choose “New Rule”Choose port and click next.
Choose UDP, input the Specificnport "123" to be allowed NTP Service and click next.
Choose “Domain, Private, Public“. and click next
Place a name  "NTP 123" for the rule, a description if you like and click Finish

Done!!!