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Event ID: 1142 Source: Microsoft-Windows-DHCP-Server

The DHCP server is unable to reach the NPS server for determining the client's NAP access state. The error code returned is <error code>.
As per Microsoft: "Network Policy Server (NPS) is the Microsoft implementation of a Remote Authentication Dial-In User Service (RADIUS) server and proxy in the Windows Server 2008 operating system". See the link to "TechNet Event ID 1142 - DHCP NAP: NPS Availability" for more details.

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