Windows 7, the latest operating system from Microsoft is also its first operating system that automatically synchronizes the PC clock to an Internet source of UTC time (Coordinated Universal Time). From the moment you switched to a Windows-7-computer and the Internet, it will take time to establish and signals from the Microsoft time service - time.windows.com.
While for most users this saves them the burden of adjustment and correction of their clock as itTunnels, for business users as it is Internet time sources are not secure and receive a time source through the UDP port on the firewall could lead to security breaches, and as Internet time sources may not be using NTP (Network Time Protocol can be authenticated problematic), the signals can be exploited by malicious users.
This Internet time source can be disabled by opening the clock and date dialogue, and openness of the Internet Time tab, by setting "Change" button andDisabling the "Synchronize with an Internet time server" option.
While this will certainly get no unwanted traffic through the firewall, it will also mean that the Windows 7 machine is not synchronized to UTC and its timing will depend on the motherboard clock that is finally driving.
To synchronize a network with Windows-7-machines, an accurate and reliable source clock should be the most practical and simplest solution is to plug in a separate NTPTime server. Them directly to a router or switch and allow the secure reception of an atomic clock time source.
NTP time servers use the highly accurate and reliable GPS signals (Global Positioning System) anywhere on the planet or more localized long wave signals transmitted by several national physics laboratories such as NIST and NPL.
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