The system is not configured to require a strong session key.

From Windows Vista Security Technical Implementation Guide

Associated with IA controls: ECSC-1

SV-29250r1_rule The system is not configured to require a strong session key.

Vulnerability discussion

This setting controls the required strength of a session key.

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Configure the policy value for Computer Configuration -> Windows Settings -> Security Settings -> Local Policies -> Security Options -> “Domain Member: Require Strong (Windows 2000 or Later) Session Key” to “Enabled”.

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