0x1 + 0x8 = 0x9 [ 0x1: special interval | 0x8: force as client] Edit: Tested with0x1 Computer Configuration > Administrative Templates > System > Windows Time Service > Time Providers. Server: ntp.myserver.org Type: NTP Keep the Windows time service running. Read this: https://docs.microsoft.com/de-de/windows-server/networking/windows-time-service/windows-time-service-tools-and-settings