Effective 1 January 2011, we will no longer support any Certificate Signing Request [CSR] generated with a 1024 bit key. This is because NIST, PKIX, WebTrust and other respective security standards no longer consider the 1024 bit key size as secure. Read more > [1]
Login to the Site Administrator or Appliance Administrator and select the site to administer.
Select Services
Select the Actions box next to Apache Web Server and then select SSL Settings
Select Generate and fill in the required details, the site name will automatically be entered into the Common Name field, ensure this is correct and contains the Fully Qualified Domain Name (e.g. secure.digi-sign.com, www.digi-sign.com [2], support.digi-sign.net
Select Save and you are presented with the RSA Key and the Certificate Request (CSR)
Copy the Certificate Request into a text editor; this will be required when you purchase your certificate. Do not delete this request, as it will be needed during the installation of your SSL certificate.
Links:
[1] https://www.digi-sign.com/about/announcements/2048
[2] http://www.digi-sign.com