Event ID 22 — RADIUS Client Availability

Applies To: Windows Server 2008

RADIUS clients must be available to Network Policy Server (NPS) in order for NPS to process connection requests.

Event Details

Product: Windows Operating System
ID: 22
Source: NPS
Version: 6.0
Message: The Network Policy Server (NPS) could not send a response due to a network error. The data is the error code generated by Windows Sockets.


Establish RADIUS client availability

To establish RADIUS client availability:

  • Use Windows Sockets error messages and documentation to determine the Windows Sockets reason for failure and the resolution steps. For more information, see Windows Sockets Error Codes at http://go.microsoft.com/fwlink/?LinkId=95404.


To verify that Windows Sockets errors are fixed:

  1. Connect to the network through the previously unavailable RADIUS client. On a network access client that is allowed by policy to connect to the network, such as a wireless client that is a domain member computer for which there are network policies that grant access, attempt to connect to the network with a valid user account and credentials.
  2. If the server running NPS performs authentication and authorization in a normal amount of time, the network and Windows Sockets errors are resolved.

RADIUS Client Availability

Network Policy Server Infrastructure