デジタル証明書の設定

 SSLCertificateFile      /usr/local/apache/ssl/server.crt
 SSLCertificateKeyFile   /usr/local/apache/ssl/server.key
 SSLCertificateChainFile /usr/local/apache/ssl/intermediate.crt

参考

https://knowledge.rapidssl.com/support/ssl-certificate-support/index?page=content&actp=CROSSLINK&id=SO6252