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Why does my Windows Time Service not synchronize with my NTP Server?

Possible troubleshooting may proceed as follows:

 

  • Firewall or port filter is blocking NTP packages.
  • Make sure that firewall settings in Windows enable UDP protocol in both ways (inbound/outbound) on port 123.
  • Some w32time versions coming with Windows XP or Windows Server 2003 may be unable to query the time from NTP servers.
  • A workaround for the recognized problem is to change the behaviour of the w32time.

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See also

What does the “Requests per second” key figure mean for the number of clients in the network that a time server can synchronize? NTP Network Bandwidth for synchronization? Why do you need your own NTP server although there are NTP servers available on the internet? What is the difference between NTP and SNTP?