There's more going on the exchange than a simple authentication.

The data in the Access-Request packet may have correct data for authentication. The server will correctly authenticate the entity. However server signs the response packet with a different secret than the client making the signature incorrect.

The client must check the signature on the Access-Accept packet and if it's not correct must reject the authentication even though the reply type is Access-Accept.

DilipSimha.N.M wrote:
hi,

If the shared-secret mismatches bwtween NAS and RADIUS server,
then still the access-accept message is sent from RADIUS server to NAS.

why is access-reject message not sent???

--DilipSimha
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