by default, MWG policy allows CONNECT requests for HTTPS connections on port 443 in list "Allowed CONNECT Ports" in rule "Restrict Destination Port to Allowed CONNECT Ports" in rule set "Common Rules".
There, you would need to add the port 8443. Please notice, that you so allow all connections to connect on that port. If you further want to restrict this, you maybe need to create a new rule above that which checks for the URL host "portail.beac.int" AND uses a new/second list where you add single port 8443 with action "Stop Rule Set".
So, only this website matches with new configured rule based on URL host and port 8443 and all other websites still match with the default rule where port 443 is configured.
Regards, Marcel Kutrieba Technical Support Engineer
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