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You may experience one of the following issues:

  • You can see the shared files but cannot open them.

  • When you open a shared file, the loading progress bar is displayed as zero percent.

  • When you open a shared file or a folder, Windows explorer freezes.

  • If you try to restart the Server service, the service freezes in the stopping state.

  • Microsoft Office Access databases (.mdb files) that are hosted on Windows Server 2012 shares may be corrupted.

  • A "file is locked by another user" or "is locked for editing" error occurs in Microsoft Excel.

  • SMB2 dialect negotiation receives only a TCP ACK response.


To resolve this issue in Windows Server 2012 R2 or Windows Server 2012, install update 2955164 or 2955163. For more information about how to obtain update 2955164 or 2955163, click the following article numbers to view the articles in the Microsoft Knowledge Base:

2955164 Windows RT 8.1, Windows 8.1, and Windows Server 2012 R2 update rollup: May 2014

2955163 Windows RT, Windows 8, and Windows Server 2012 update rollup: May 2014


To work around these issues, follow these steps:

  1. Disable the leasing on the file server. To do this, run the following command:REG ADD HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\lanmanserver\parameters /v DisableLeasing /t REG_DWORD /d 1 /f Note After you set this registry key, SMB2 leases are no longer granted, but oplocks are still available. This setting is primarily used for troubleshooting.

  2. Restart the file server, or restart the server service. To restart the service, run the following commands:NET STOP SERVER


Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

More Information

For more information about software update terminology, click the following article number to view the article in the Microsoft Knowledge Base:

824684 Description of the standard terminology that is used to describe Microsoft software updates For more information about SMB leasing, go to the following MSDN website:

Client caching features: Oplock vs. Lease

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