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Windows Server 2008 - OS - Enabling NTP on domain controllers for non-Windows clients

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Windows Server 2008 - OS - Enabling NTP on domain controllers for non-Windows clients

Postby lmmtux » Wed Mar 19, 2014 11:42 am

The Windows Time Service runs on all domain controllers and by default will allow Windows client to synchronize with it. However, if you have non-Windows clients on your network that you wish to synchronize time to your domain controllers using the standard NTP service, there are some additional steps needed to allow this.


Enabling NTP for non-Windows clients

Note: The steps below involve editing the registry. Please make sure to back up your registry before making changes, see the Microsoft article on backing up the registry.

  1. Open the registry editor as an administrator on the domain controller.
  2. Navigate to each of the settings below and set their values as shown below. If the value specified does not exist, create it as shown in the included screenshot.
    • HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\W32Time\Parameters
      Set "Type" to "NTP".
      ntp4.jpg
      ntp4.jpg (30.6 KiB) Viewed 1851 times
    • HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\W32Time\Config
      Set "AnnounceFlags" to 5 (decimal or hex).
      ntp5.jpg
      ntp5.jpg (30.41 KiB) Viewed 1851 times
    • HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\W32Time\Parameters
      Add a REG_SZ value of "NtpServer" and specify at least two public NTP servers. Separate each NTP server with a space.
      ntp6.jpg
      ntp6.jpg (37.59 KiB) Viewed 1851 times
    • HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\W32Time\TimeProviders\NtpClient
      Set "SpecialPollInterval" to 900 (decimal) or 384 (hex).
      ntp7.jpg
      ntp7.jpg (56.89 KiB) Viewed 1851 times
  3. Exit the registry editor.
  4. Restart the Windows Time service in the Services control panel.
  5. Ensure that NTP is enabled in the Windows Firewall (port 123 UDP).
    ntp8.jpg
    ntp8.jpg (19.85 KiB) Viewed 1851 times
  6. Check to make sure various clients can now sync with NTP.


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lmmtux
 
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