PDC server unable to sync with external time source

I'm currently doing migration of AD servers window server 2003 to window server 2012. I transfered the FSMO roles to a window server 2012 AD. The server is a vmware virtual machine.

The virtual machine time is not sync with the host. I run the command to point to external time source.

w32tm /config /update /manualpeerlist:mst.sirim.my,time.sirim.my /syncfromflags:MANUAL /reliable:yes

When I type w32tm /resync /rediscover

Message appear "the computer did not resync because no time data was available".

I test ping both external source i get ping reply back.

I run w32tm /query /source

it return: "free-running time system clock"

How I'm able to make my new 2012 pdc server to sync with external source?

Thanks