Domain Controller authentication is not required to unlock the workstation.

From Windows XP Security Technical Implementation Guide

Part of Domain Controller authentication for unlock

Associated with IA controls: ECSC-1

SV-18419r1_rule Domain Controller authentication is not required to unlock the workstation.

Vulnerability discussion

This setting controls the behavior of the system when you attempt to unlock the workstation. If this setting is enabled, the system will pass the credentials to the domain controller (if in a domain) for authentication before allowing the system to be unlocked. This will be set to disabled per the FDCC.

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Fix text

Workstations - Configure the policy value for Computer Configuration -> Windows Settings -> Security Settings -> Local Policies -> Security Options -> “Interactive logon: Require domain controller authentication to unlock workstation” to “Disabled”.

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