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I´m trying to connect to my Samba share in my QNAP NAS from a Windows 8 client. The name and password are the same both in the Windows client and the NAS server. I got an authentication error, so I tried the same thing in Windows 7 and it works. So what is the difference between Windows 7 and Windows 8? What can I do to authenticate correctly without needing to use different credentials to access my Samba share?

karel
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Abraham
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1 Answers1

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Windows 8 and Windows 2012 introduced a "Secure Negotiate" feature to SMB, and they're configured to require Secure Server Signing by all SMB servers. The fix is to either tell the SMB server to enable signing (assuming your server is capable of signing), or to tell your Windows 8 client(s) to disable Secure Negotiate.

See Microsoft's description of this problem, or this page dealing with the same issue on a NetApp filer.

QNAP may have an upgraded firmware for your NAS which supports SMB 2.24 or newer, and the SMB signing necessary for native communication with newer Windows clients. They at least do for the Turbo NAS. So if you have a Turbo NAS, you could take this route.

Disabling Secure Negotiate on a Windows 8 client is easy, though. Start PowerShell, and enter the following command:

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

Note that this can also be easily changed later with -Value 1, if an upgrade to the NAS firmware comes later on.

Lars Rohrbach
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