Why does my Windows Time Service (w32time) not synchronize with my NTP Server?

Troubleshooting tips:

1. A firewall or port filter can be blocking NTP network packets. Make sure that firewall settings in Windows allow both inbound and outbound UDP packets on port 123. Read more ...
   
   
2. 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 known problem is to change the behavior of the w32time service. Read more ...
   
   
3. In "Windows Services", check if w32time is enabled and running properly. Read more ...
   
   
4. The network connection to an NTP server can be unpredictable and prone to failures or huge variable delays (jitter). Read more ...
   
   

More details on this topic can be found here.

MEINBERG NTP Time Server

Time and Frequency Synchronization Platform in 1U Rackmount-Enclosure

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NTP time server platform for modular time synchronization systems

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