I would have a look at the
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\W32Time\Parameters
key.  On your PDC in the forest root domain the type should be set to NTP,
and on the remaining DCs the type should be set to Nt5DS.
I should add that we also ran into a situation where net time was
inaccurately reporting that our DCs and member servers were synced with a
specific member server - which they were not supposed to be synced with.  It
turns out that MS does not support using net time on a Win2K3 domain as it
inaccurately reports back.  The resolution they gave us was to use w32tm,
and it turned out that our time was fully intact.
It would have been nice for them to publish something about net time not
being supported on Win2K3 DCs :-)

John 

-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Phil Renouf
Sent: Friday, April 08, 2005 10:36 AM
To: [email protected]
Subject: Re: [ActiveDir] Time Sync between Forest Root and Child Domains

On Apr 7, 2005 11:52 AM, [EMAIL PROTECTED] <[EMAIL PROTECTED]>
wrote:
> Set the time source on your Root PDC with net time /setsntp:SERVERNAME
> 
> On all other DC's do not set a time source with net time /setsntp:
> 
> By not setting a time source the DC's should all default to the Forest
Root
> PDC.
> 
> Or you can manually set the other DC's to sync with your forest PDC with
> net time /setsntp:PDCname

Actually the DCs of the child domain will use the PDCe of its domain
or any DC of the parent domain to sync it's time. Also, the PDCe of
the child domain will any DC of the parent domain to sync it's time.

KB article for how to set windows to use an external timesource. As
mentioned by Chris you would do this on the PDCe of the forest root.

http://support.microsoft.com/kb/816042

Phil
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