I am using Free radius to perform EAP-TLS. However when my client certificates reaches EAP, following error is generated. Is there any specific requirement (in terms of encoding) for the client side certificates. Any help will be appreciated. Thanks in advance. rlm_eap: Request found, released from the list rlm_eap: EAP/tls rlm_eap: processing type tls rlm_eap_tls: Authenticate rlm_eap_tls: processing TLS eaptls_verify returned 7 rlm_eap_tls: Done initial handshake rlm_eap_tls: <<< TLS 1.0 Handshake [length 0007], Certificate rlm_eap_tls: >>> TLS 1.0 Alert [length 0002], fatal handshake_failure TLS Alert write:fatal:handshake failure TLS_accept:error in SSLv3 read client certificate B rlm_eap: SSL error error:140890C7:SSL routines:SSL3_GET_CLIENT_CERTIFICATE:peer did not return a certificate rlm_eap_tls: SSL_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 11 modcall: leaving group authenticate (returns reject) for request 11 auth: Failed to validate the user. --