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NTP Servers (Time Server)

Windows computers do not synchronize time on available time servers (NTP). Initially I thought it would be a problem with the Windows installation, however this occurs on more than one device. I removed the NextDNS settings, restarted the machines and was able to synchronize normally, both with the windows servers themselves and the Brazilian ones as listed below:

a.st1.ntp.br
b.st1.ntp.br
c.st1.ntp.br
d.st1.ntp.br
a.ntp.br
b.ntp.br
c.ntp.br
gps.ntp.br

I request support in this regard, since I have already put all these servers on the White List and even then they had no effect. I noticed that Android devices are apparently not affected. However, as I'm not always on the home network, I don't know if it's correct.

Translation performed through Google Translate. Original text in Portuguese.

12 replies

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    • Calvin_Hobbes
    • 1 yr ago
    • Reported - view

    Pretty sure windows uses a Microsoft NTP server.   Check your logs

      • Luiz_Fernando
      • 1 yr ago
      • Reported - view

      Calvin Hobbes I checked all the logs, and indeed it timed out. The answer is this: The 'VMICTimeProvider' time provider has indicated that the current operating and hardware environment is not supported and has stopped. This is expected behavior for VMICTimeProvider in non-HyperV guest environments. This may also be expected behavior for the current provider in the current operating environment.

      • Luiz_Fernando
      • 1 yr ago
      • Reported - view

      Calvin Hobbes 

      • Luiz_Fernando
      • 1 yr ago
      • Reported - view

      Calvin Hobbes 

      • Calvin_Hobbes
      • 1 yr ago
      • Reported - view

      Luiz Fernando sorry, I meant check the NextDNS logs.    You could also use wire shark with a filter for NTP.    I stopped using windows several years ago so I don’t have a system to use for troubleshooting.     

      • Calvin_Hobbes
      • 1 yr ago
      • Reported - view

      Luiz Fernando I just looked closer at your Windows log.   Is your Windows installed as a Virtual Machine?    If so, what is the hypervisor?

      • Luiz_Fernando
      • 1 yr ago
      • Reported - view

      Calvin Hobbes It is not. It's on the main machine. However, it displays a message as if it were installed in a virtual machine. I noticed that too.

      • Calvin_Hobbes
      • 1 yr ago
      • Reported - view

      Luiz Fernando  the only thing remaining that I can think of is to use Wireshark to see what NTP server your system is attempting to use.    Wireshark can appear to be overwhelming if you’ve never used it, but with a very simple capture filter could easily get the job done.  

    • Calvin_Hobbes
    • 1 yr ago
    • Reported - view

    It might be as simple as adding time.windows.com to the allow list

      • Luiz_Fernando
      • 1 yr ago
      • Reported - view

      Calvin Hobbes Thanks for the help, but I already did that... I put the whole list of possible ntp servers in the white list or allowed list. Unfortunately it still didn't work. As I tested it without the NextDNS dns and the time servers work without them, so there's something wrong somewhere that I still can't identify.

      • Calvin_Hobbes
      • 1 yr ago
      • Reported - view

      Luiz Fernando have you tried installing wire shark and creating a capture filter for NTP?   That should clearly find the offending fqdn.    Btw, is your system part of a windows AD domain?

      • Luiz_Fernando
      • 1 yr ago
      • Reported - view

      Calvin Hobbes I did not do this. But I will. No, my system is domestic. There is no virtual machine installed. I only use a desktop and a notebook, both with Windows 11 in the latest version and also without any firewall or third-party antivirus.

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