Windows 10 1709 Cannot Access SMB2 Share Guest Access
After Upgrading to Windows 10 1709 (Fall Creators Update) I couldn’t access my Synology NAS anymore. Therefore I started troubleshooting the Windows 10 1709 Cannot Access SMB2 Share Guest Access error:
An error occurred while reconnecting X: to \\nas\data Microsoft Windows Network: You can’t access this shared folder because your organization’s security policies block unauthenticated guest access. These policies help protect your PC from unsafe or malicious devices on the network.
Cause # Starting with Windows 10 1709, Windows prevents you from accessing network shares with guest access enabled. Guest access means connecting to network shares without authentication, using the built-in “guest” account.
This has no reference to the SMB1 protocol which was disabled in the latest Windows 10 release.
Resolution # To enable guest access again, configure the following GPO:
Computer configuration > administrative templates > network > Lanman Workstation: "Enable insecure guest logons" = Enabled
Registry Key # The according registry key is located under: