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An Access-Request message was received from RADIUS client <client> without a message authenticator attribute when a message authenticator attribute is required. Verify the configuration of the RADIUS client in the Internet Authentication Service snap-in (the "Client must always send the message authenticator attribute in the request" checkbox) and the configuration of the network access server.
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What is an authentication protocol?
As per Microsoft: "This event record indicates that there is a network access server (NAS) signature problem because NAS or the Radius proxy was not set for attaching signatures". See MSW2KDB for more details.
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