To install the AlphaSSL Root Certificates, perform the following steps:
In the Virtual Host settings for your site, in the virtual site file, you will need to add the following SSL directives. This may be achieved by:
1. Copy the intermediate CA file to the same directory as the certificate.
2. Add the following line to the virtual host file under the virtual host domain for your site (assuming /etc/ssl/crt is the directory mentioned in 1.), if the line already exists amend it to read the following:
SSLCACertificateFile /etc/ssl/crt/ca.txt
If you are using a different location and certificate file names you will need to change the path and filename to reflect this.
The SSL section of the updated virtual host file should now read similar to this example (depending on your naming and directories used):
SSLCertificateFile /etc/ssl/crt/yourdomainname.crt
SSLCertificateKeyFile /etc/ssl/crt/private.key
SSLCACertificateFile /etc/ssl/crt/ca.txt
Save your virtual host file and restart Apache.