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.