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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 (30.6 KiB) Viewed 1927 times
    • HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\W32Time\Config
      Set "AnnounceFlags" to 5 (decimal or hex).
      ntp5.jpg (30.41 KiB) Viewed 1927 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 (37.59 KiB) Viewed 1927 times
    • HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\W32Time\TimeProviders\NtpClient
      Set "SpecialPollInterval" to 900 (decimal) or 384 (hex).
      ntp7.jpg (56.89 KiB) Viewed 1927 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 (19.85 KiB) Viewed 1927 times
  6. Check to make sure various clients can now sync with NTP.

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