Hi Alan,   Im new to freeRADIUS, trying to implement it for my test machine running currently on Ubuntu 9.04 Server.Im trying to establish a communication between Windows XP,SP3 client and RADIUS SERVER ( on Ubuntu Server) through EAP/TLS and cerrtificates.   The problem i m facing is, when i run the server in debug mode it gives me this warning - -------------------------------------------------------------------------------------------------------------- Module: Linked to sub-module rlm_eap_md5  Module: Instantiating eap-md5  Module: Linked to sub-module rlm_eap_leap  Module: Instantiating eap-leap  Module: Linked to sub-module rlm_eap_gtc  Module: Instantiating eap-gtc    gtc {         challenge = "Password: "         auth_type = "PAP"    } Ignoring EAP-Type/tls because we do not have OpenSSL support. Ignoring EAP-Type/ttls because we do not have OpenSSL support. Ignoring EAP-Type/peap because we do not have OpenSSL support.  Module: Linked to sub-module rlm_eap_mschapv2  Module: Instantiating eap-mschapv2    mschapv2 {         with_ntdomain_hack = no    }  I tried to install the patch available for OpenSSL, but the error still persists.   Also, i tried to run the rlm_eap_ttls.c file but the error i get is --   root@ubuntu:/etc/freeradius-2.1.9+dfsg/src/modules/rlm_eap/types/rlm_eap_ttls# ./configure checking for OpenSSL support... no configure: WARNING: silently not building rlm_eap_ttls. configure: WARNING: FAILURE: rlm_eap_ttls requires: OpenSSL. configure: creating ./config.status config.status: creating Makefile config.status: creating config.h config.status: config.h is unchanged     It would be great if you can help me get through this issue.   Regards,   Amrita