Invalid command ‘SSLEngine’, perhaps misspelled or defined by a module not included in the server configuration

sudo service apache2 reload

* Reloading web server apache2
* The apache2 configtest failed. Not doing anything.
Output of config test was:
AH00526: Syntax error on line 26 of /etc/apache2/sites-enabled/sitename.ru.conf:
Invalid command 'SSLEngine', perhaps misspelled or defined by a module not included in the server configuration
Action 'configtest' failed.
The Apache error log may have more information.

Решение

sudo a2enmod ssl