A Microsoft Windows Network Policy Server (RADIUS) logs the System Error: “An Access-Request message was received from RADIUS client x.x.x.x with a Message-Authenticator attribute that is not valid.”
September 28, 2020
Problem You notice that wireless clients authenticating with a wireless controller that uses a Microsoft Windows Network Policy server fails and the following error is logged: Log Name: System Source: NPS Event ID: 18 Level: Error An Access-Request message was received from RADIUS client 172.23.192.16
