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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