The roadwarrior carol sets up a connection to gateway moon using EAP-TTLS authentication only with the gateway presenting a server certificate and the client doing EAP-MD5 password-based authentication. In a next step the EAP-TNC protocol is used within the EAP-TTLS tunnel to determine the health of carol via the TNCCS 2.0 client-server interface compliant with RFC 5793 PB-TNC.
Unfortunately moon sends his first PB-TNC batch with a wrong version number . Therefore the connection setup fails due to a fatal PB-TNC error.