[ntp:questions] Issues with w32tm on AD network

Danny Mayer mayer at ntp.isc.org
Sun Mar 2 04:57:42 UTC 2008

Danny Mayer wrote:
> Martin Burnicki wrote:
>> Evandro,
>> Evandro Menezes wrote:
>>> On Feb 27, 7:06 am, Ryan Malayter <malay... at gmail.com> wrote:
>>>> This is not true. Windows time service uses UDP/123, just like every
>>>> other NTP or SNTP implmentation. All of Microsoft's documentation that
>>>> I have read (and I think I have read everything concerning w32time)
>>>> agrees on that point.
>>> That's true.  But W32TIME also registers the time service to the
>>> domain or AD hierarchy, allowing the workstations to synchronize with
>>> it.  
>> That's what I meant in one of my earlier posts.
>>> But when the workstations contact the DC, I think that NTP will 
>>> reply instead.
>> If that setup really works then it's indeed a good workaround for using ntpd
>> on the PDC.
>> Unfortunately I've currently no W2k3 domain set up for testing ...
> I do. My main machine at home is a domain controller running Active 
> Directory. I needed this for some Kerberos work that I was doing. I also 
> run BIND 9.5.0 on it rather than Microsoft's DNS.
> I have search for information in it but I don't see anything specific 
> and it didn't seem to add any records to the DNS when I ran w32time on it.
> Danny

Check out this PDF document:


which seems to indicate that it uses RPC to get its list of time servers.


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