I have client certificate configured and working in Apache. I want to pass the PEM-encoded X.509 certificates of the client to the backend server. I tried with the SSLOptions +ExportCertData. This does nothing at all, while the documentation states it should add SSL_SERVER_CERT, SSL_CLIENT_CERT and SSL_CLIENT_CERT_CHAINn (with n = 0,1,2,..) as headers. Any ideas why this option is not working? I then tried setting the headers myself using RequestHeader. This works fine for all variables except SSL_CLIENT_CERT_CHAIN. It shows null in the header. Any ideas why the certificate chain is not being filled? This is my first Apache configuration: <VirtualHost 192.168.56.100:443> ServerName www.test.org ServerAdmin webmaster@localhost DocumentRoot /var/www ErrorLog ${APACHE_LOG_DIR}/error.log LogLevel warn CustomLog ${APACHE_LOG_DIR}/ssl_access.log combined SSLEngine on SSLProxyEngine on SSLCertificateFile /etc/apache2/ssl/certs/www.test.org.crt SSLCertificateKeyFile /etc/apache2/ssl/private/www.test.org.key SSLCACertificateFile /etc/apache2/ssl/ca/ca.crt <Proxy *> AddDefaultCharset Off Order deny,allow Allow from all </Proxy> <Location /carbon> ProxyPass http://www.test.org:9763/carbon ProxyPassReverse http://www.test.org:9763/carbon </Location> <Location /services/GbTestProxy> SSLVerifyClient require SSLVerifyDepth 5 SSLOptions +ExportCertData ProxyPass http://www.test.org:8888/services/GbTestProxy ProxyPassReverse http://www.test.org:8888/services/GbTestProxy </Location> </VirtualHost> This is my second Apache configuration: <VirtualHost 192.168.56.100:443> ServerName www.test.org ServerAdmin webmaster@localhost DocumentRoot /var/www ErrorLog ${APACHE_LOG_DIR}/error.log LogLevel warn CustomLog ${APACHE_LOG_DIR}/ssl_access.log combined SSLEngine on SSLProxyEngine on SSLCertificateFile /etc/apache2/ssl/certs/www.test.org.crt SSLCertificateKeyFile /etc/apache2/ssl/private/www.test.org.key SSLCACertificateFile /etc/apache2/ssl/ca/ca.crt <Proxy *> AddDefaultCharset Off Order deny,allow Allow from all </Proxy> <Location /carbon> ProxyPass http://www.test.org:9763/carbon ProxyPassReverse http://www.test.org:9763/carbon </Location> <Location /services/GbTestProxy> SSLVerifyClient require SSLVerifyDepth 5 RequestHeader set SSL_CLIENT_S_DN "%{SSL_CLIENT_S_DN}s" RequestHeader set SSL_CLIENT_I_DN "%{SSL_CLIENT_I_DN}s" RequestHeader set SSL_CLIENT_S_DN_CN "%{SSL_SERVER_S_DN_CN}s" RequestHeader set SSL_SERVER_S_DN_OU "%{SSL_SERVER_S_DN_OU}s" RequestHeader set SSL_CLIENT_CERT "%{SSL_CLIENT_CERT}s" RequestHeader set SSL_CLIENT_CERT_CHAIN0 "%{SSL_CLIENT_CERT_CHAIN0}s" RequestHeader set SSL_CLIENT_CERT_CHAIN1 "%{SSL_CLIENT_CERT_CHAIN1}s" RequestHeader set SSL_CLIENT_VERIFY "%{SSL_CLIENT_VERIFY}s" ProxyPass http://www.test.org:8888/services/GbTestProxy ProxyPassReverse http://www.test.org:8888/services/GbTestProxy </Location> </VirtualHost> Hope someone can help. Regards, nidkil