[ntp:questions] ntpq-equivalent for Microsoft's Windows Time Service ?

Danny Mayer mayer at ntp.org
Wed Apr 1 12:35:34 UTC 2009

Bart Van Assche wrote:
> On 1 apr, 09:39, Bart Van Assche <bart.vanass... at gmail.com> wrote:
>> I would like to monitor the operation of the NTP-algorithm as
>> implemented in Microsoft's Windows Time Service (I know that older
>> w32time implementations only support SNTP, and that newer
>> implementations support both SNTP and NTP). I already found out that
>> it is possible to query the configuration settings of the Windows Time
>> Service through the w32tm /dumpreg command (equivalent of cat /etc/
>> ntp.conf), and that it is possible to compare the local clock with a
>> remote clock through the w32tm /monitor command (equivalent of ntpdate
>> -q). I would like to be able to query the internal variables of the
>> Windows Time Service, just like the command ntpq -p does. Does anyone
>> know whether this is possible with the Windows Time Service provided
>> by Microsoft ?
>> The official Microsoft documentation of the Windows Time Service can
>> be found here:http://technet.microsoft.com/en-us/library/cc773061.aspx.

Microsoft doesn't support queries (mode 6 packets) at all so it's
impossible to query for state. They have a blog for the windows time
service here: http://blogs.msdn.com/w32time/default.aspx if you want do
dig in. They also state that they do not support high accuracy time and
that's it's meant just to deal with the Kerberos requirements in RFC
1510 to have clocks between Kerberos client and server within 5 minutes
of each other. That's to prevent (or at least reduce) replay attacks.


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