An Access-Request message was received from RADIUS client %1 without a Message-Authenticator attribute when a Message-Authenticator ...

An Access-Request message was received from RADIUS client %1 without a Message-Authenticator attribute when a Message-Authenticator attribute is required. Verify the configuration of the RADIUS client in the Network Policy Server snap-in (the "Client must always send the Message-Authenticator attribute in the request" checkbox) and the configuration of the network access server.