Error message when you try to establish a dial-up VPN connection that uses EAP-TLS for authentication in Windows Vista: "Error: 0x80420100: There was an unknown error"

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Article ID: 947209 - View products that this article applies to.
This article has been archived. It is offered "as is" and will no longer be updated.
This article has been archived. It is offered "as is" and will no longer be updated.
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Symptoms

On a computer that is running Windows Vista, you try to establish a dial-up virtual private network (VPN) connection that uses Extensible Authentication Protocol-Transport Layer Security (EAP-TLS) for authentication.

If there are no user certificates on the computer, you may receive the following error message:
Error: 0x80420100: There was an unknown error.

Properties

Article ID: 947209 - Last Review: January 16, 2015 - Revision: 2.0
Applies to
  • Windows Vista Enterprise 64-bit Edition
  • Windows Vista Home Basic 64-bit Edition
  • Windows Vista Home Premium 64-bit Edition
  • Windows Vista Ultimate 64-bit Edition
  • Windows Vista Business
  • Windows Vista Business 64-bit Edition
  • Windows Vista Enterprise
  • Windows Vista Home Basic
  • Windows Vista Home Premium
  • Windows Vista Starter
  • Windows Vista Ultimate
Keywords: 
kbnosurvey kbarchive kbtshoot kberrmsg kbexpertisebeginner kbprb KB947209

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