Logon information must be provided to unlock a locked computer. For domain accounts, this security setting determines whether a domain controller must be contacted to unlock a computer. If this setting is disabled, a user can unlock the computer using cached credentials. If this setting is enabled, a domain controller must authenticate the domain account that is being used to unlock the computer. Default: Disabled. Important This setting applies to Windows 2000 computers, but it is not available through the Security Configuration Manager tools on these computers. Fix: (1) GPO: Computer Configuration\Windows Settings\Security Settings\Local Policies\Security Options\Interactive logon: Require Domain Controller authentication to unlock workstation (2) REG: HKEY_LOCAL_MACHINE\Software\Microsoft\Windows NT\CurrentVersion\Winlogon!ForceUnlockLogon