I'm using LWP to post data to a > https server. The Server needs the certificate for Authentication. I have the Cert.pfx certificate which is given for the installation on to the browser. Using Openssl I could get the privatekey.pem and publickey.pem from the cert.pfx. I used the following commands to do that openssl pkcs12 -in CERT.pfx -clcerts -out certonly.pem -nokeys openssl pkcs12 -in CERT.pfx -clcerts -out keys.pem openssl rsa -in keys.pem -pubout -out pubkey.pem -text openssl rsa -in keys.pem -pubout -out pubkey.pem openssl rsa -in keys.pem -pubin -text >private.key openssl rsa -pubout <keys.pem >public.key Now In my perl script I used the following code. use LWP::UserAgent; use HTTP::Cookies; #for testing use LWP::Debug '+'; $cookie = new HTTP::Cookies( ignore_discard => 1 ); $ua = new LWP::UserAgent; $ENV{https_proxy}="2342xxxxx:80"; $ua->proxy(http => $ENV{"HTTP_Proxy"}) if $ENV{"HTTP_Proxy"}; $ua->cookie_jar( $cookie ); $ua->agent("Mozilla/8.0"); #get the cookie $ENV{HTTPS_VERSION} = '3'; $ENV{HTTPS_CERT_FILE} = '/certs/certonly.pem'; $ENV{HTTPS_KEY_FILE} = '/certs/keysnopass.pem'; #####$ENV{HTTPS_CA_FILE} = "some_file"; #####$ENV{HTTPS_CA_DIR} = "some_dir"; $request = new HTTP::Request('GET', 'https:///'); $res = $ua->request( $request ); if ($res->is_success) { print "Success\n"; print "As_string: ", $res->as_string, "\n"; } else { print "FAILED: ", $res->code, " ", $res->message, "\n"; } But the server is not able to authnticate. I guess its looking for $ENV{HTTPS_CA_FILE} and $ENV{HTTPS_CA_DIR}. I don't know what to pass to these variables. Can you please advice me on this. I have the Cert.pfx file. How do I make the CA_file etc. Please suggest me on this.Let me know if I am doing some thing wrong. Thanks in advance. Regards, Kris