The problem is that the WP Crontrol plugin tries to trigger WP Cron by making a loopback request to your website. However, that doesn’t work, because it is blocked by this security system:
However, this does not stop WP Cron from working in general, or stop you from triggering it yourself.
If you are in this position because cron jobs are not being processed, that’s usually the result of a plugin adding very big, or even broken tasks to the cron queue, or just adding too many of them, which is preventing WordPress from processing these tasks correctly.
To verify, you can trigger WP Cron manually by visiting http://kantoris.xyz/wp-cron.php in your browser.