Prevent NTLM from falling back to a Null session.

From Windows 7 Security Technical Implementation Guide

Part of NTLM NULL Session Fallback

Associated with IA controls: ECSC-1

SV-25275r1_rule Prevent NTLM from falling back to a Null session.

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This setting prevents NTLM from falling back to a Null (unauthenticated) session.

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Configure the policy value for “Network Security: Allow LocalSystem NULL session fallback” to “Disabled”.

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