Invalid command sslengine conf when we restart Apache
We get the error "invalid command sslengine conf" when we try to restart Apache, after having added lines in the configuration files about a ssl certificate, for example through the Let's Encrypt module.
To avoid that can of issue, you have to enable the ssl protocol first :
sudo a2enmod ssl
Then restart Apache :
sudo systemctl restart apache2
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The content of the file named options-ssl-apache.conf can help you to determine how to setup a file for a SSL version of your virtual host configuration ...