Guest Access in SMB2 disabled on 1709 version of Windows 10 and Windows Server 2016

When you try to access to a consumer or old NAS with your brand new Windows 10 Fall Creators Update you will face a network access error.
Due to security issue in SMB protocol, the new Windows 10 and Windows Server 2016 release 1709 start with some SMB feature disabled by default:

  • SMBv1 not installed (enable it with Enable-WindowsOptionalFeature -Online -FeatureName SMB1Protocol)
  • SMBv2 Guest Access disabled

As Microsoft state:
In Windows 10 Fall Creators Update and Windows Server version 1709, the SMB2 client no longer allows the following actions:

  • Guest account access to a remote server
  • Fallback to the Guest account after invalid credentials are provided

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Windows 10 Fall Creators Update

Windows 10 Fall Creators Update was released and I want to point at some enterprise features we could rely on (most of them are in Client Hyper-V feature).
Please refer to Windows 10 Blog to read about all the new features added with this release.

Ransomware protections.

Microsoft are introducing Windows Defender Exploit Guard that helps protect files from unauthorized changes by nefarious applications and your applications from unknown exploits. Additionally, Windows Defender Antivirus now has specific safeguards in place, along with default enhanced coverage that is delivered instantly via the cloud protection service. These and other security technologies protect against persistent ransomware campaigns like Cerber, Locky, and Spora, as well as global outbreaks like WannaCry, and Petya. Read More