Authentication fails when Radius accounting is enabled with Defender (4369610)

Authentication fails when Radius accounting is enabled with defender.

The Defender Security Server stops responding to authentication requests and the CPU usage of the Defender Security Server service shows 25%.
Authentications can only continue once the Defender Security Server service is restarted.

STATUS:
Issue fixed in Defender 6.5.1.

WORKAROUND:
Disable Radius Accounting on the Defender Access node by removing the 'Accounting Port' entry.