Add the following line to SSL section of the httpd.conf (assuming /etc/httpd/conf is the directory to where you have copied the ca.txt file). if the line already exists amend it to read the following:
SSLCACertificateFile /etc/httpd/conf/ca-bundle/ca.txt
[7] There are four stages to set up SSL on your Apache web server:
[7] The complexities of the SSL protocol remain invisible to your customers. Instead their browsers provide them with a key indicator to let them know they are currently protected by an SSL encrypted session – the Padlock:
[7] The Internet has created many new global business opportunities for enterprises conducting online commerce. However, the many security risks associated with conducting e-commerce have resulted in security becoming a major factor for online success or failure.
Links:
[1] https://www.digi-sign.com/digi-ssl/using%20ssl
[2] https://www.digi-sign.com/digi-ssl/isp%20services
[3] https://www.digi-sign.com/digi-ssl/extended%20ssl
[4] https://www.digi-sign.com/digi-ssl/apache/apply%20online%20certificate2
[5] https://www.digi-sign.com/digi-ssl/apache/apply%20online%20certificate1
[6] https://www.digi-sign.com/digi-ssl/apache/step%20instructions%20apache1
[7] https://www.digi-sign.com/downloads/download.php?id=aacd-digi-ssl-pdf
[8] https://www.digi-sign.com/support/digi-ssl/generate+csr
[9] https://www.digi-sign.com/digi-ssl/apache/certificate%20ssl
[10] https://www.digi-sign.com/digi-ssl/apache/displaying%20ssl5
[11] https://www.digi-sign.com/digi-ssl/apache%20guide/what%20ssl3
[12] https://www.digi-sign.com/digi-ssl/apache%20guide%20