Windows Security Alert appears when connecting to a wireless network on a workgroup machine

Article ID: 2518158 - View products that this article applies to.
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Symptoms

While connecting to a wireless network on a Windows system that is part of a workgroup, a Windows Security Alert dialog similar to the following may be displayed:

The server “<Authentication server>” presented a valid certificate issued by “<CA name>”, but “<CA name>” is not configured as a valid trust anchor for this profile. Further, the server “<Authentication server>” is not configured as a valid NPS server to connect to this profile.

or

The server “<Authentication server>” presented a valid certificate issued by “<CA name>”, but “<CA name>” is not configured as a valid trust anchor for this profile.

If you click the Connect button on the dialog box, the wireless connection will be established successfully. 

Cause

To validate the server certificate, Windows will check if the second element in the chain, the Certification Authority (CA) that issued the end certificate, is a trusted CA for Windows NT Authentication. A CA is considered to be trusted if it exists in the "NTAuth" system registry store found in the CERT_SYSTEM_STORE_LOCAL_MACHINE_ENTERPRISE store location. If this verification fails, either of the warning messages in the Symptoms section could occur. By default, the CA certificate is not in the NTAuth store on a Windows system that is part of a workgroup.

Resolution

To workaround the issue, you can export the certificate of the CA that issued the certificate to the authentication server to a file. Copy the file to the workgroup machine and then run the following command from an elevated Command Prompt:

certutil -enterprise -addstore NTAuth CA_CertFilename.cer

More Information

About How to import third-party certification authority (CA) certificates into the Enterprise NTAuth store, please refer to http://support.microsoft.com/kb/295663
Note This is a "FAST PUBLISH" article created directly from within the Microsoft support organization. The information contained herein is provided as-is in response to emerging issues. As a result of the speed in making it available, the materials may include typographical errors and may be revised at any time without notice. See Terms of Use for other considerations.

Properties

Article ID: 2518158 - Last Review: May 20, 2011 - Revision: 3.0
APPLIES TO
  • Windows 7 Enterprise
  • Windows 7 Professional
  • Windows 7 Ultimate
  • Microsoft Windows XP Professional
  • Microsoft Windows XP Professional x64 Edition
  • Windows Vista Business
  • Windows Vista Business 64-bit Edition
  • Windows Vista Enterprise
  • Windows Vista Enterprise 64-bit Edition
  • Windows Vista Ultimate
  • Windows Vista Ultimate 64-bit Edition
  • Windows 7 Home Basic
  • Windows 7 Home Premium
  • Windows 7 Starter
  • Microsoft Windows XP Home Edition
  • Windows Vista Home Basic
  • Windows Vista Home Basic 64-bit Edition
  • Windows Vista Home Premium
  • Windows Vista Home Premium 64-bit Edition
  • Windows Vista Starter
Keywords: 
KB2518158

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