I described how to configure an authoritative time server in Windows 2000 and how to configure the Windows Time service on the Windows Server 2003 forest root PDC emulator.

In Windows 2000, I used:

net time /setsntp:,

In Windows Server 2003, I used:

w32tm /config /syncfromflags:manual /manualpeerlist:,
w32tm /config /update

Where is the NTP server ntp2.usno.navy.mil                                and  is the NTP server tock.usno.navy.mil
To view the US Naval Observatory Master Clock time, use http://tycho.usno.navy.mil/cgi-bin/timer.pl