1. Stop the !W32Time service with :C:\>net stop w32time
2. Configure the external NTP server by typing :C:\> w32tm /config /syncfromflags:manual /manualpeerlist:1stNTP.domain.com,2ndNTPserver.domain.com
3. Then make your PDC a reliable NTP server with <strong><em> C:\&gt;w32tm /config /reliable:yes</em></strong>
4. Start the w32time service with :C:\&gt;net start w32time
5. You can check the NTP service's configuration by typing:C:\&gt;w32tm /query /configuration
6. Run services.msc and set the Windows Time Service to automatic start

References