[ntp:questions] Issues with w32tm on AD network

Danny Mayer mayer at ntp.isc.org
Tue Feb 26 03:48:22 UTC 2008

Evandro Menezes wrote:
> I'm pretty sure that it's possible to run both NTP and W32TIME at the
> same time on the same Windows system provided that only NTP is used to
> keep the clock under discipline and W32TIME is used solely to provide
> the time for the domain workstations.

No, this is untrue. They both use the 123/UDP port. You cannot have more 
than one application listening on the socket. Furthermore they cannot 
both discipline the clock.


> In order to do this, the NTP service is added to the dependency list
> of the W32TIME service through the Platform SDK utility SC:
> sc config w32time depend= NTP
> It's also necessary to disable W32TIME from trying to discipline the
> clock using the registry editor (REGEDIT) under HKLM\CurrentControlSet
> \Services\w32time:
> [TimeProviders\NtpClient]
> InputProvider=DWORD:0
> [TimeProviders\NtpServer]
> InputProvider=DWORD:0
> This will cause NTP to start before W32TIME and thus NTP will take
> over disciplining the Windows DC clock and the domain workstations
> will still communicate with W32TIME.

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