Article ID: 947209 - Last Review: February 6, 2008 - Revision: 1.1

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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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.
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
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Keywords: 
kbtshoot kberrmsg kbexpertisebeginner kbprb KB947209
 

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