Vista provides a feature that automatically synchronizes the system clock with a time server on the Internet. Vista turns on this feature by default, and updates your system clock periodically. You can turn it off, or update it immediately. Like the date and time settings,you must be part of the administrators group to change the Internet time synchronization settings for your system. In addition, to use this feature you must have the Windows Time service running.
To configure the Internet time synchronization for your system, click the clock in the notification area and then click the Change Date and Time Settings link, or double-click the Date and Time applet in the Control Panel.
Select the Internet Time tab. Notice that this tab tells you the time of the next automatic synchronization when you have Internet time synchronization enabled. Click Change Settings.click Continue in the User Account Control dialog box that appears.
you’ll see the Internet Time Settings dialog box shown below.Check Synchronize with an Internet Time Server when you want to perform automatic time updates. Choose one of the time servers listed in the Server field, and click OK twice to make the change permanent. You can also click Update Now to update the time on your system immediately and click ok 2 times to close all windows.
Change Default Sync Value
By default, Windows checks the time against the time server once a week. If you want to use some other interval, go to
and set the decimal value of the SpecialPolInterval key to some other value in seconds.
Adding Multiple Time Servers at Once
One easy way to add a lot of time servers to the Registry at once is to create a REG file containing them in Notepad. For example, you could create the following text file in Notepad and save it as timesrvr.reg (or whatever name you want, as long as it has a .reg extension)
Windows Registry Editor Version 5.00
You can keep going ad infinitum with the list, giving each time server you want to add a consecutive number. Then save your work and close Notepad. Locate the file in Windows Explorer, right-click it and click on merge.
Open Firewall Port
This does require access to the internet using UDP port 123 and can be blocked if your firewall is not configured properly.So make sure your software firewall (Windows firewall,Norton internet security,McAfee Security center,Zone Alarm etc),Hardware fiewall(Netgear,Belkin etc).
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