help EAP-TNC

Hi all, I'm working in setting up a basic scenario which involves 3 components: a client using Xsupplicant a AP making use of hostapd and a Radius server using FreeRadius ;). I'm trying to probe the EAP-TNC method but i have received this message from the FreeRadius server: rlm_eap: ERROR: EAP-TNC must be run inside of a TLS method. I've configured EAP-TLS and this method alone it is working properly. So when I put in configuration file --> default_eap_method = tnc FreeRadius shows the message before. I think that in some way TLS must be configured or something to transport EAP-TNC, ok? (is possible to do this?) is posible test EAP-TNC with the current version of FreeRadius? Regards, Fernando.