In this tutorial i will be going through tracing Invalid command 'SSLPassPhraseDialog' error and find a solution for it.
Apache SSL Error: Invalid command 'SSLPassPhraseDialog'
Most of the cases this means that mod_ssl is not loaded correctly, try to find or locate mod_ssl.so and be sure that it's there in your system.
If mod_ssl.so is not available then you need to install it.
yum install mod_ssl
You can also find all mod_ssl obsolete and old versions here and install it manually.
After you finish restart the apache server by running any of the below commands
service httpd restart
systemctl start httpd