URL cron command fail via Webmin

Hello to all,

When I use via a web navigator a URL to command a regular action on a site, it works well. The site use CiviCRM.
The URL command is like : “https://SITE-URL/sites/all/modules/civicrm/bin/cron.php?name=LOGIN&pass=PASSWORD&key=SITE-KEY
But if I set a cron via Webmin the command fail.

Here is the Webmin line :
/usr/bin/wget -O --q -t 1 “https://SITE-URL/sites/all/modules/civicrm/bin/cron.php?name=LOGIN&pass=PASSWORD&key=SITE-KEY
The command line was provided by CiviCRM documentation. It used to work well until recently. But now there is an error :

ERROR: The certificate of ‘SITE-URL’ is not trusted.
ERROR: The certificate of ‘SITE-URL’ hasn’t got a known issuer.

So the direct command via a web navigator works, but the same command via the Webmin cron fails…

Webmin and the Site are on the same server. How can correct the cron line in Webmin ?
Could it be a wrong setting on the SSLCertificateFile for the site ? Webmin and the site are on the same server.