On the domain controller with roles primary FSMO, open cmd as administrator, then:
(ony execute in the primary dc)
w32tm /query /status
w32tm /config /manualpeerlist:"yourNTPserver1,0x8 yourNTPserver2,0x8" /syncfromflags:manual /reliable:yes /update
(example: w32tm /config /manualpeerlist:"192.168.1.1,0x8 192.168.1.2,0x8" /syncfromflags:manual /reliable:yes /update )
w32tm /resync /rediscover
net stop w32time && net start w32time
w32tm /resync /rediscover
w32tm /query /status
