Sorry to hear you are having problem with the radius domain name. Our record indicated the DNS name for radius server was supported in release 4.1.1. The 4.2 release is not available. Please download 4.1.2 (released in Oct) on Cambium Support site. Please also share your ‘show running-config’ for our investigation.
Debug message is currently printed on console and telnet session.
Please follow the steps below to enable debug session.
Enable telnet connection: config terminal;telnet enable
Connect to telnet session, and enable debug message on telnet: config terminal;debug-logging session