Hi xhevdetpllana and Giuseppe.
Before cron jobs will work, you have to enable the cron in crontab (linux). To do this, SSH to your server and sudo as root:
List current cronjobs:
sudo crontab -l
Edit cronjobs:
sudo crontab -e
The editor will probably be something like pico. Enter the following cron job (taken from the example on ilias):
0 2 * * * APACHEUSER /usr/bin/php ILIAS_ABSOLUTE_PATH/cron/cron.php ILIAS_ADMIN ILIAS_ADMIN_PWD CLIENT > /dev/null
Once you change the values, yours will look something like:
*/15 0 * * * www-data /usr/bin/php /var/www/ilias/cron/cron.php admin a_secret_password ABCD > /dev/null
The above cron will run every 15 minutes for client ABCD .
The official documentation can be found at:
Regards,
Adam