Servers lose hour configuration, domain GPO.

Question

Hello,

Wen have some problems with some servers that they had the time 3 minutes out of phase. DCs are corrects, they synchronize with a an external source without problems.

I have configured a GPO to force clients to synchronize with DCs with this options:

The crossed out part is our DC PDC.

After a few days i check some servers with w32tm /query /source and some had de PDC as source but other had Local cmos clock. I checked this servers and they had the correct GPO option configuration in

With this servers dont take the PDC as source?

Thanks.

Answer 1

Some general info

• All domain members should use NT5DS domain time.
• Desktops and member servers sync with any domain controller.
• Domain controllers sync with PDC emulator (one per domain)
• PDC emulator in child domain can sync with any domain controller in parent domain.
• PDC emulator in parent domain syncs with either a hardware clock or possibly an external source.
  https://blogs.technet.microsoft.com/nepapfe/2013/03/01/its-simple-time-configuration-in-active-directory/

For all problem members beside PDC emulator you can
w32tm /unregister
net stop w32time
w32tm /register
net start w32time
w32tm /config /syncfromflags:domhier /update
net stop w32time
net start w32time
then check
w32tm /query /source
w32tm /query /configuration

--please don't forget to upvote and Accept as answer if the reply is helpful--

Answer 2

Why i put the commands in a .bat file:

Why are you doing that?

Answer 3

I have been checking events and i found the problem. We have two DCs, DC1 have all roles. DC1 take the hour of an external source.

The most of servers has like time source DC2.

DC1 have time-service events, 50
DC2 have time-service events, 24, 50 and 124.

1 - If the GPO is configured with the DC1 as a time source why the most of servers have DC2 as a time source ?
2 - Why there are time-service events ? both DCs are in the same vlan. DC1 has no conectivity problems with his external time source.

Many thanks.