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NPS and Domain Controller Communication

  • Article

Applies To: Windows Server 2008 R2

Network Policy Server (NPS) contacts domain controllers to perform authentication and authorization for connection requests received from configured RADIUS clients. If NPS cannot contact domain controllers, it cannot perform authentication and authorization, and network access authentication will fail.

Events

Event ID Source Message

4400

NPS

 A LDAP connection with domain controller %1 for domain %2 is established.

4401

NPS

 Domain controller %1 for domain %2 is not responsive. NPS switches to other DCs.

4402

NPS

 There is no domain controller available for domain %1.

Network Policy Server (NPS)

Network Policy Server Infrastructure