Microsoft Windows Server 2012 R2 – fails to connect to a third-party file server that supports the SMBv2 file protocol

mswindows_logo.jpg   This problem is caused by the „Secure Negotiate“ feature that was added to SMB 3.0 for Windows Server 2012 R2 – this feature depends upon the correct signing of error responses by all SMBv2 servers including servers that support only protocol versions 2.0 and 2.1 – some third-party file servers (e.g. older samba versions) do not return a signed error response

You can disable the „Secure Negotiate“ feature by using PowerShell on a Windows Server 2012 R2

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

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