Installing Existing Certificate on Linux/Apache

Using the pfx file from Windows run the following commands using it as your ‘in’ file to export the certificate and key files

openssl pkcs12 -in STAR2022.pfx -nocerts -out star2022-E.key -nodes
openssl pkcs12 -in STAR2022.pfx -nokeys -out star2022.pem -nodes

Then remove the password from the key file

openssl rsa -in STAR2022-E.key -out star2022.key

Locate the Apache conf file in which SSL is configured. (i.e. /etc/httpd/conf.d/ssl.conf)
Edit the file using vi or nano noting then changing the following lines.

SSLCertificateFile /etc/pki/tls/certs/2016star.pem
SSLCertificateFile /etc/pki/tls/certs/currentyearstar.pem

SSLCertificateKeyFile /etc/pki/tls/private/2016star.key
SSLCertificateKeyFile /etc/pki/tls/private/currentyearstar.key

Open WinSCP and connect to the server in question.
Browse to the directories shown above and copy the appropriate files into them. Restart Apache (i.e. service httpd restart)