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Have you verified that dns is set correctly on cleint and DC:<a href="http://abhijitw.wordpress.com/2012/03/03/best-practices-for-dns-client-settings-on-domain-controller/" rel="ugc">http://abhijitw.wordpress.com/2012/03/03/best-practices-for-dns-client-settings-on-domain-controller/</a><br />
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Can you check the event log on client computer for any errors and warning when the issue occurs,Exclude share folder from AV scanning and check.
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Have you verified that dns is set correctly on cleint and DC:http://abhijitw.wordpress.com/2012/03/03/best-practices-for-dns-client-settings-on-domain-controller/ [http://abhijitw.wordpress.com/2012/03/03/best-practices-for-dns-client-settings-on-domain-controller/]

Can you check the event log on client computer for any errors and warning when the issue occurs,Exclude share folder from AV scanning and check.

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Hi Sandeshdubey,<br />
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Check the DNS server, found nothing is wrong.
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Hi Sandeshdubey,

Check the DNS server, found nothing is wrong.

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Have you checked the event log when the problem occured.
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Have you checked the event log when the problem occured.

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Yes i did, no error logged.
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A new MS Windows 2012 server was setup. It works as a DC and file server as well. Every desktops were automatically mapped several drives with file shares offered from this server. However, found that while in the Windows explorer, the user click any of the mapped drive, what the user can see is the &quot;hour glass&quot;. And out of sudden, everything back to normal, and user can use files/folders in the mapped drives again.<br />
<br />
What's went wrong? How to solve the problem?
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A new MS Windows 2012 server was setup. It works as a DC and file server as well. Every desktops were automatically mapped several drives with file shares offered from this server. However, found that while in the Windows explorer, the user click any of the mapped drive, what the user can see is the "hour glass". And out of sudden, everything back to normal, and user can use files/folders in the mapped drives again.

What's went wrong? How to solve the problem?

Why contents of mapped drives not accessible once in a while?

Windows Server 2012 is the server version of Windows 8 and the successor to Windows Server 2008 R2. Windows Server 2012 is the first version of Windows Server to have no support for Itanium-based computers since Windows NT 4.0. Windows Server 2012, now in its second release (Windows Server 2012 Release 2) includes Foundation, Essentials, Standard and Datacenter, and does not support IA-32 or IA-64 processors.

Windows Server 2012

The Microsoft Server topic includes all of the legacy versions of the operating system, including the Windows NT 3.1, NT 3.5, NT 4.0 and Windows 2000 and Windows Home Server versions.