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Domain controller sync time

Posted on 2014-12-12
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Last Modified: 2015-10-03
I have a domain controller on another site connected via LAN extender. The time drifted out on this domain controller. I am unsure how this happened as I thought the domain controller should be syncing time with the PDC every few minutes. I am not referring to external time sources. All other DC's are fine.
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Question by:Sid_F
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by:JBond2010
ID: 40495984
You need to ensure that AD replication is functioning and is not broken. From the problematic DC, open the command prompt and run this command;

repadmin /syncall /AdeP

Also, you need to ensure that ports are not being blocked for AD communication. The port number for time is UDP port 123. Ensure that the DC can communicate with the PDC DC on this port.

Regards,

JBond2010
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by:FinServCo
ID: 40496094
Is this a virtual machine?  I've had issues with DCs on VMWare.  Even if you check the box that says don't sink with the host server, I've had them do that.  So I've had to set VMWare's NTP to point to the PDC emulator to make sure it's time is in sink with the DCs.
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by:Sid_F
ID: 40496157
All DC's are physical.
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by:FinServCo
ID: 40500816
So if you run a "net time /querysntp" on the server in question, it doesn't have any time sources configured?
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by:Sid_F
ID: 40506698
Correct
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by:JBond2010
ID: 40508838
How many Domain Controllers are in your environment? Which Domain Controller is holding the PDC role? Domain Controllers update their time from the Domain Controller that is holding the PDC role - 1 of 5 FSMO roles in Active Directory.

On one of the Domain Controllers open the command prompt and type

netdom query fsmo

This will tell you which Domain Controller is holding the FSMO Roles.


Regards,

JBond2010
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by:Sid_F
ID: 40512604
4 DC's I know which DC is holding the roles but it still doesn't shed any light on why the time sync fell out. thanks.
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