configuration de plusieurs certificats ssl sur le même serveur/ip sur des CENTO avec apache 2.2

Je suis en utilisant cette référence pour configurer plusieurs certificats ssl sur la même adresse IP sur CENTOS 6.3 avec apache 2.2

<VirtualHost \*:443>

        ServerAdmin webmaster@localhost
        ServerName www.domain1.org
        ServerAlias domain1.org
        DocumentRoot /var/www/vhosts/domain1.org/

        #   SSL Engine Switch:                                                                                                                                                                                                   
        #   Enable/Disable SSL for this virtual host.                                                                                                                                                                            
        SSLEngine on

        #   A self-signed (snakeoil) certificate can be created by installing                                                                                                                                                    
        #   the ssl-cert package. See                                                                                                                                                                                            
        #   /usr/share/doc/apache2.2-common/README.Debian.gz for more info.                                                                                                                                                      
        #   If both key and certificate are stored in the same file, only the                                                                                                                                                    
        #   SSLCertificateFile directive is needed.                                                                                                                                                                              
        SSLCertificateFile  /home/tmp/ssl/domain1.crt
        SSLCertificateKeyFile /home/tmp/ssl/domain1.key

</VirtualHost>
<VirtualHost \*:443>

        ServerAdmin webmaster@localhost
        ServerName www.domain2.org
        ServerAlias domain2.org
        DocumentRoot /var/www/vhosts/domain2.org/

        #   SSL Engine Switch:                                                                                                                                                                                                   
        #   Enable/Disable SSL for this virtual host.                                                                                                                                                                            
        SSLEngine on

        #   A self-signed (snakeoil) certificate can be created by installing                                                                                                                                                    
        #   the ssl-cert package. See                                                                                                                                                                                            
        #   /usr/share/doc/apache2.2-common/README.Debian.gz for more info.                                                                                                                                                      
        #   If both key and certificate are stored in the same file, only the                                                                                                                                                    
        #   SSLCertificateFile directive is needed.                                                                                                                                                                              
        SSLCertificateFile  /home/tmp/ssl/domain2.crt
        SSLCertificateKeyFile /home/tmp/ssl/domain2.key

</VirtualHost>

Au démarrage, je reçois l'avertissement suivant :

\[warn\] \_default\_ VirtualHost overlap on port 443, the first has precedence

quand je visite les différents sites, il me montre toujours le premier certificat. qu'est-ce qui ne va pas ?