Hi, I'm trying to perform a EAP-TTLS Radius Authentication by using the server certificates. So, from my windows laptop I have selected at the "Step 2: TTLS Server" --> "Validate Server Certificate" I have follow the steps at http://wiki.freeradius.org/WPA_HOWTO#HOWTO_Do_It:_An_Outline But the server response is.... ..... auth: type "EAP" Processing the authenticate section of radiusd.conf modcall: entering group authenticate for request 2 rlm_eap: Request found, released from the list rlm_eap: EAP/ttls rlm_eap: processing type ttls rlm_eap_ttls: Authenticate rlm_eap_tls: processing TLS eaptls_verify returned 7 rlm_eap_tls: Done initial handshake rlm_eap_tls: <<< TLS 1.0 Alert [length 0002], fatal unknown_ca TLS Alert read:fatal:unknown CA TLS_accept:failed in SSLv3 read client certificate A rlm_eap: SSL error error:14094418:SSL routines:SSL3_READ_BYTES:tlsv1 alert unknown ca rlm_eap_tls: SSL_read failed inside of TLS (-1), TLS session fails. In SSL Handshake Phase In SSL Accept mode rlm_eap: SSL error error:140940E5:SSL routines:SSL3_READ_BYTES:ssl handshake failure rlm_eap_tls: BIO_read failed in a system call (-1), TLS session fails. eaptls_process returned 13 rlm_eap: Freeing handler modcall[authenticate]: module "eap" returns reject for request 2 modcall: leaving group authenticate (returns reject) for request 2 auth: Failed to validate the user. ..... Any idea of where is the mistake? Thanks in advance.