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

References