How to fix PDC server sync with external NTP source?

Victor Pei PEI 0

Below image is about the PDC server system event prompt the warning. I have enable NTP client and cofigure NTP server IP is external NTP server IP address.

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Daisy Zhou 28,906 Reputation points Microsoft Vendor

2025-01-20T09:41:59.1966667+00:00

Hello

Thank you for posting in Q&A forum.

Please check if you configure the NTP time server correctly. For more information to configure NTP time server on PDC and other domain machines, please refer to this similar thread below.

https://learn.microsoft.com/en-us/answers/questions/1846018/how-do-i-configure-an-ntp-server-in-group-policy?page=0&orderby=Helpful#answers

1.Then please check if you can ping the NTP server.
2.Please make sure that the UDP port 123 is open on Domain Controller.

3.Restart the W32Time service.

I hope the information above is helpful.

If you have any questions or concerns, please feel free to let us know.

Best Regards,

Daisy Zhou

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Victor Pei PEI 0 Reputation points

2025-01-21T01:35:06.16+00:00

Hi Daisy:

Thanks for your help, and I have check all the parameters in PDC server, the details for below:

For PDC server ,I config GPO for NTP client. I have enable NTP Client and NTP server,NTP server IP address 192.168.192.1, and ping feature is successful.

For join Domain server, all the server can sync time with PDC server, I use w32time command "w32tm /query /status "

For Firewall policy , I have opened UDP port 123.

Issues :

When I disable PDC server NTP Client and NTP server features, for PDC server time use Local source from LOCAL COMS CLOCK. and then all the join DC server can sync with PDC server, working nornal.

But when I enable PDC server NTP client and NTP server features, for PDC server can sync time with external NTP server source, but all the join DC computer can not sync with PDC server. and I find join DC computer system event as below image:

Only PDC server time source from local COMS clock , other join DC computer can sync time with PDC server working nornal.

I use NETTIME software test NTP source is working , and it can sync with external NTP server interval.
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