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Tuesday, July 30, 2013

On many NAS devices, SMB Signing is enabled as it causes a rather large performance hit.  When accessing a NAS configured with SMB signing disabled, Windows 8 and Windows 2012 machines cannot browse the folder structure.  Other versions of Windows do not have problems.

If using DFS, the problem presents itself as a DFS problem.  However, the problem is due to not being able to browse the DFS target, not the DFS link itself.

I have confirmed this to be an issue with EMC and Netapp, and I'm sure it is the same with all vendors.

Disable SMB Signing by setting the RequireSecureNegotiate value to 0.  The registry key is located in:

Or you can use the following powershell one-liner to set it for you:

Set-ItemProperty -Path “HKLM:\SYSTEM\CurrentControlSet\Services\LanmanWorkstation\Parameters” RequireSecureNegotiate -Value 0 -Force