This security policy setting determines whether the operating system generates audit events for RADIUS (IAS) and Network Access Protection (NAP) activity on user access requests (Grant, Deny, Discard, Quarantine, Lock, and Unlock).
NAP events can be used to understand the overall health of the network.

Event volume: Medium to high on servers running Network Policy Server (NPS); moderate on other servers or on client computers

If this policy setting is configured, the following events are generated. The events appear on computers running Windows Server 2008 R2, Windows Server 2008, Windows 7, Windows Vista with Service Pack 2 (SP2), or Windows Vista with Service Pack 1 (SP1).

• 6272: Network Policy Server granted access to a user.
• 6273: Network Policy Server denied access to a user.
• 6274: Network Policy Server discarded the request for a user.
• 6275: Network Policy Server discarded the accounting request for a user.
• 6276: Network Policy Server quarantined a user.
• 6277: Network Policy Server granted access to a user but put it on probation because the host did not meet the defined health policy.
• 6278: Network Policy Server granted full access to a user because the host met the defined health policy.
• 6279: Network Policy Server locked the user account due to repeated failed authentication attempts.
• 6280: Network Policy Server unlocked the user account.