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NPS fails reason code 266

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Hi,

Recently I started getting complaints that internal wireless users couldn't connect to our internal network.  We have the following setup:

Windows 2008 Server with NPS role installed - fully patched with the most current patches from MS.

NetGear WNDAP350 Access Point

The WNDAP350 AP is configured to use Radius and points to Windows 2008 server with NPS installed.

This has all been working fine for several years but starting about two weeks ago I noticed that users were no longer able to connect using this AP.  I looked at the NPS logs and I see the following event in the event log now:

Network Policy Server denied access to a user.

Contact the Network Policy Server administrator for more information.

User:
 Security ID:   DDD\User
 Account Name:   DDD\User
 Account Domain:   DDD
 Fully Qualified Account Name: DDD\User

Client Machine:
 Security ID:   NULL SID
 Account Name:   -
 Fully Qualified Account Name: -
 OS-Version:   -
 Called Station Identifier:  00-26-F2-F7-FE-A0:wirelessAP
 Calling Station Identifier:  88-53-2E-A0-C4-63

NAS:
 NAS IPv4 Address:  172.16.0.246
 NAS IPv6 Address:  -
 NAS Identifier:   hello
 NAS Port-Type:   Wireless - IEEE 802.11
 NAS Port:   0

RADIUS Client:
 Client Friendly Name:  mywap
 Client IP Address:   172.16.0.246

Authentication Details:
 Proxy Policy Name:  Use Windows authentication for all users
 Network Policy Name:  Secure Wireless Connections
 Authentication Provider:  Windows
 Authentication Server:  ADC1.ddd.com
 Authentication Type:  PEAP
 EAP Type:   -
 Account Session Identifier:  -
 Reason Code:   266
 Reason:    The message received was unexpected or badly formatted.

I haven't made any changes in the configuration other than applying the most recent set of MS patches that were released on the most recent patch Tuesday.  I thought maybe the problem was the AP so I replaced it with a backup and I still have the same problem.  Did the most recent MS patches break something? 

Thanks in advance,
Nick


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