The local NPS proxy server received a RADIUS message that is malformed from a remote RADIUS server, and the message is unreadable. ...

The local NPS proxy server received a RADIUS message that is malformed from a remote RADIUS server, and the message is unreadable. This issue can also be caused if a connection request contains more than the expected number of user-name attributes, or if the user-name attribute value is not valid, such as if the value has zero length or if it contains characters that are not valid.