Certificates Validadtion

[Fernando Calvelo Vazquez]

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.