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Is the server a VM? &nbsp;Make sure it's time sync is not set. <br />
<br />
Is the server the PDC Emulator (FSMO Role)?<br />
<br />
Are there any errors in the event logs that are related to that?<br />
<br />
You should probably read over this blog:<br />
<a href="http://blogs.technet.com/b/nepapfe/archive/2013/03/01/it-s-simple-time-configuration-in-active-directory.aspx" rel="ugc">http://blogs.technet.com/b/nepapfe/archive/2013/03/01/it-s-simple-time-configuration-in-active-directory.aspx</a>
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Is the server a VM?  Make sure it's time sync is not set.

Is the server the PDC Emulator (FSMO Role)?

Are there any errors in the event logs that are related to that?

You should probably read over this blog:
http://blogs.technet.com/b/nepapfe/archive/2013/03/01/it-s-simple-time-configuration-in-active-directory.aspx [http://blogs.technet.com/b/nepapfe/archive/2013/03/01/it-s-simple-time-configuration-in-active-directory.aspx]

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Dear sir,<br />
<br />
We have Window 2008 R2 domain controller which time is different, i want to set internet time on this DC &nbsp;so that we can fix one time for all domain environments.
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Dear sir,

We have Window 2008 R2 domain controller which time is different, i want to set internet time on this DC  so that we can fix one time for all domain environments.

Window server 2012

Windows Server 2008 and Windows Server 2008 R2, based on the Microsoft Vista codebase, is the last 32-bit server operating system released by Microsoft. It has a number of versions, including including Foundation, Standard, Enterprise, Datacenter, Web, HPC Server, Itanium and Storage; new features included server core installation and Hyper-V.