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Let’s see how you can configure NTP Server on Windows Server 2019. The Windows Time service uses the Network Time Protocol (NTP) to help synchronize time across a network. NTP is an Internet time protocol that includes the discipline algorithms necessary for synchronizing clocks (Microsoft Docs).

Step 1: Open up Registry Editor

Click on the start icon in your Server and search for “Run” application. From the “Run” application, type in “regedit” and hit “Enter”. This will fire up our Registry Editor as shown below.

NTP Regedit

A Window similar to the one below will ensue

NTP Regedit Window

Step 2: Go to the NtpServer Path

Follow the following Registry tree to arrive where our target configuration lies. Computer>HKEY_LOCAL_MACHINE>SYSTEM>CurrentControlSet>Services>W32Time>TimeProviders>NtpServer.

The image below shows us at the end of the tree. As you can see, the right pane has files which are what as are looking for.

NTP Regedit Window NtpServerHighlighted

Step 3: Enable NtpServer

Double click on “Enabled” file which will open a small window. On the window, there is a part called “Value data”. Change the value from 0 to 1 as illustrated below. Click “OK” after changing.

NTP Regedit Window EnabledClicked

Step 4: Make the AnnounceFlags 5

Within this path: Computer>HKEY_LOCAL_MACHINE>SYSTEM>CurrentControlSet>Services>W32Time>, go into “Config”, that is: Computer>HKEY_LOCAL_MACHINE>SYSTEM>CurrentControlSet>Services>W32Time>Config.

NTP Regedit Window AnnounceFlagsHighlighted

While there, you will see a file named “AnnounceFlags” on the right pane as shown above. As you can guess, double click on it. That will open a small window similar to the one in Step 3. Under “Value data“, change the value from a to 5.

NTP Regedit Window AnnounceFlagsChange

From Microsoft, the following are the description of all available AnnounceFlags:

Entry controls whether this computer is marked as a reliable time server. A computer is not marked as reliable unless it is also marked as a time server.

  • 0x00 Not a time server
  • 0x01 Always time server
  • 0x02 Automatic time server
  • 0x04 Always reliable time server
  • 0x08 Automatic reliable time server
    The default value for domain members is 10. The default value for stand-alone clients and servers is 10.

Step 5: Restart NtpServer

Open up “Services” by hitting on the Windows key and searching for Services. Once open, look for “Windows Time”. Right-click on it and click on “Restart

NTP Services Restart

Step 6: Open UDP port 123 in Firewall

For this, follow How To open a port in Windows Server Firewall guide. Remember that this port is UDP and not TCP.

Configure NTP Server on Windows 2019 using PowerShell

If you are a PowerShell person, then open up your Powershell as administrator and run the commands below and you will be good go.

Enable NtpServer

Set-ItemProperty -Path "HKLM:\SYSTEM\CurrentControlSet\Services\w32time\TimeProviders\NtpServer" -Name "Enabled" -Value 1

Make the AnnounceFlags 5

Set-ItemProperty -Path "HKLM:\SYSTEM\CurrentControlSet\services\W32Time\Config" -Name "AnnounceFlags" -Value 5 

Restart NtpServer

Restart-Service w32Time


Now our NTP Server is ready to synchronize time across your network. Next, we are going to add our clients and then enjoy better time synchronization. Thank you for spending your time on the site and for reading through. There are a bunch of more guides for you on the blog, just look below for a sample.

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You can support us by downloading this article as PDF from the Link below. Download the guide as PDF