Logon information is required to unlock a locked computer. For domain accounts, the Interactive logon: Require Domain Controller authentication to unlock workstation setting determines whether it is necessary to contact a domain controller to unlock a computer. If you enable this setting, a domain controller must authenticate the domain account that is being used to unlock the computer. If you disable this setting, logon information confirmation with a domain controller is not required for a user to unlock the computer. However, if you configure the Interactive logon: Number of previous logons to cache (in case domain controller is not available) setting to a value that is greater than zero, then the user's cached credentials will be used to unlock the computer. Note: 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