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Event ID: 14 Source: IAS

Source
Level
Description
A request was received with an authenticator that is not valid from client <friendly client name>
Comments
 
As per Microsoft: "This event record indicates that the client and server shared secrets may be out of synchronization or a secret is not valid". See MSW2KDB for additional information about this event.
I had this - it turned out that although I had remembered to add my RRAS server to the list of RADIUS clients in IAS I had left it at the default client type of RADIUS when it should be set to MICROSOFT.

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