Differents between Plesk and Kloxo-MR is:
Plesk:
SSLEngine on
SSLVerifyClient none
SSLCertificateFile /usr/local/psa/var/certificates/cert-J4VI9T
SSLCACertificateFile /usr/local/psa/var/certificates/cert-RAJF5P
Kloxo-MR:
SSLEngine on
SSLProtocol ALL -SSLv2 -SSLv3
SSLHonorCipherOrder On
SSLCipherSuite ECDH+AESGCM:DH+AESGCM:ECDH+AES256:DH+AES256:ECDH+AES128:DH+AES:ECDH+3DES:DH+3DES:RSA+AESGCM:RSA+AES:RSA+3DES:!aNULL:!MD5:!DSS
SSLCertificateFile /home/kloxo/client/admin/ssl/c532h.bigraf.com.pem
SSLCertificateKeyFile /home/kloxo/client/admin/ssl/c532h.bigraf.com.key