NTP Client errors and Time different in SharePoint Servers

Question

Hi,
In SharePoint 2019 Servers there were below errors found in all servers and in some servers time is different thatn in another servers.
When we check with our System they suggest to open UDP Port 123
Is Open Port 123 is safe ?

Answer 1

That one by itself may not be a problem. Look for other Time-Service 35, 37 events. Assuming the members all got the domain firewall profile you shouldn't need to fiddle with firewall.

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/

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