Audit logon events This security setting determines whether to audit each instance of a user logging on to or logging off ...

Audit logon events  This security setting determines whether to audit each instance of a user logging on to or logging off from a computer.  Account logon events are generated on domain controllers for domain account activity and on local computers for local account activity. If both account logon and logon audit policy categories are enabled, logons that use a domain account generate a logon or logoff event on the workstation or server, and they generate an account logon event on the domain controller. Additionally, interactive logons to a member server or workstation that use a domain account generate a logon event on the domain controller as the logon scripts and policies are retrieved when a user logs on. For more information about account logon events, see Audit account logon events.  If you define this policy setting, you can specify whether to audit successes, audit failures, or not audit the event type at all. Success audits generate an audit entry when a logon attempt succeeds. Failure audits generate an audit entry when a logon attempt fails.  To set this value to No auditing, in the Properties dialog box for this policy setting, select the Define these policy settings check box and clear the Success and Failure check boxes.  Default: Success.