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Event ID: 20168 Source: IAS

Source
Level
Description
Could not retrieve the Remote Access Server's certificate due to the following error: The credentials supplied to the package were not recognized.
Comments
 
If you want to use 802.1x authentication with IAS under Windows Server 2003 and EAP or PEAP you will get this error if you haven't installed an enterprise CA in your Active Directory. See ME814394 for more details.
From a newsgroup post: "In my case, this error appeared after I have bought a Verisign certificate and installed it on the IAS server. To fix this I have exported the certificate to a file "w/ private key", I have delete it from certificate store and import it again in the machine store". See ME291010 and ME295663 for additional information regarding certificates.

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