You can disable the Secure Negotiate option by using PowerShell on a Windows Server 2012 or Windows 8 client. To do this, run the following command:
Powershell> Set-ItemProperty -Path "HKLM:\SYSTEM\CurrentControlSet\Services\LanmanWorkstation\Parameters" RequireSecureNegotiate -Value 0 -Force
Once this is complete, the server/workstation must be rebooted.
Ref Articles:
https://support.microsoft.com/en-us/kb/3002657
https://blogs.technet.microsoft.com/fil ... rver-2012/
http://www.infoworld.com/article/289502 ... 46049.html