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Installing a wildcard SSL certificate to secure ISPConfig default interface

First backup existing certificates (or move it to another folder)
/usr/local/ispconfig/interface/ssl

Install the key, purchased SSL certificate (wildcard cert will work well) and intermediate cert. Name them as:

ispserver.key
ispserver.crt
ispserver.bundle

Modify apache2 settings so that it observes the CA intermediate cert:

/etc/apache2/sites-available/ispconfig.vhost

  SSLEngine On
  SSLProtocol All -SSLv3
  SSLCertificateFile /usr/local/ispconfig/interface/ssl/ispserver.crt
  SSLCertificateKeyFile /usr/local/ispconfig/interface/ssl/ispserver.key
  #SSLCACertificateFile /usr/local/ispconfig/interface/ssl/ispserver.bundle

Modify the last line by removing the "#"

Then restart apache2

service apache2 restart

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