Problem
Apache refuses to start prompting Invalid command 'SSLEngine'Error'
Cause of the problem
This frequently happens on fresh Apache servers. When Apache starts it reads
through the configuration files. When it encounters SSLEngine directive, it
considers it as unknown. This is caused by the fact that the server’s basic
configuration does not have mod_ssl module installed or enabled.
Solution
On CentOS/RedHat systems
Run the following command to install mod_ssl
sudo yum install mod_ssl
On Ubuntu/Debian systems
Run the following command to enable the module:
sudo a2enmod ssl
SSL module should be enabled by now.
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