Hi all,
here my environment:
3 sites/locations :
Default-First-Site-Name (Data center) :
2 domain controllers : dc1 (Windows Server 2016 Standard) holds 5 FSMO roles (PDC), dc2 (Windows Server 2012 R2 Standard) , Forest/Domain function level : Windows Server 2008 R2.
South site : 1 domain controller dc-south (Windows Server 2016 Standard)
North site : 1 domain controller dc-north (Windows Server 2012 R2 Standard)
All DCs are virtual machines (VMWare) , our timezone : GMT+7
Recently, my dc-south time is changed erratically (right -> wrong then wrong -> right)





There is another virtual machine placed same physical host with dc-south (not joined domain) and its time is fine, other DCs time are fine.
Our settings are as default , as MS documents , primary domain controller (PDC - my dc1) does not synchronize time with an external time source , it uses local clock, other DCs synchronize time from PDC , workstation clients/other servers (joined domain) synchronize time from nearest DC at their site.
dc1
w32tm /query /status
Leap Indicator: 0(no warning)
Stratum: 1 (primary reference - syncd by radio clock)
Precision: -6 (15.625ms per tick)
Root Delay: 0.0000000s
Root Dispersion: 10.0000000s
ReferenceId: 0x4C4F434C (source name: "LOCL")
Last Successful Sync Time: 5/12/2021 2:35:29 AM
Source: Free-running System Clock
Poll Interval: 6 (64s)
dc2
w32tm /query /status
Leap Indicator: 0(no warning)
Stratum: 2 (secondary reference - syncd by (S)NTP)
Precision: -6 (15.625ms per tick)
Root Delay: 0.0312500s
Root Dispersion: 10.2717954s
ReferenceId: 0xC0A80068 (source IP: 192.168.0.104)
Last Successful Sync Time: 5/11/2021 8:46:12 AM
Source: dc1.mydomain.com
Poll Interval: 10 (1024s)
dc-south
w32tm /query /status
Leap Indicator: 0(no warning)
Stratum: 2 (secondary reference - syncd by (S)NTP)
Precision: -6 (15.625ms per tick)
Root Delay: 0.0040861s
Root Dispersion: 10.4064500s
ReferenceId: 0xC0A80068 (source IP: 192.168.0.104)
Last Successful Sync Time: 5/12/2021 11:25:23 AM
Source: dc1.mydomain.com
Poll Interval: 10 (1024s)
dc-north
w32tm /query /status
Leap Indicator: 0(no warning)
Stratum: 2 (secondary reference - syncd by (S)NTP)
Precision: -6 (15.625ms per tick)
Root Delay: 0.0312500s
Root Dispersion: 10.2620506s
ReferenceId: 0xC0A80068 (source IP: 192.168.0.104)
Last Successful Sync Time: 5/11/2021 8:41:13 AM
Source: dc1.mydomain.com
Poll Interval: 10 (1024s)
A workstation at south site
w32tm /query /status
Leap Indicator: 0(no warning)
Stratum: 3 (secondary reference - syncd by (S)NTP)
Precision: -23 (119.209ns per tick)
Root Delay: 0.0072910s
Root Dispersion: 10.5137854s
ReferenceId: 0xC0A80767 (source IP: 192.168.7.103)
Last Successful Sync Time: 5/12/2021 11:32:29 AM
Source: dc-south.mydomain.com
Poll Interval: 12 (4096s)
How can I find out what was causing the problem with dc-south time and fix it ? Please give me some advice, thank you very much.



