there are some checks of your domain - https://check-your-website.server-daten.de/?q=cloud.xts.nl
~~ 45 minutes old, only timeouts. But two checks this morning with a Grade N and a working port 80.
That configuration looks better, the current configuration can't work.
This morning, there is a Synology answer. Now (checked with my browser) there is
Apache is functioning normally
So that's
wrong, your Synology doesn't see these requests.