I have no clue to be honest. I requested the cert multiple times using either lumiballs.be and then i entered www.lumiballs.be.
My networking knowledge is also not sufficient to know what i am exactly doing. I would also assume that if the 80 and 443 ports are being blocked that i also cant acces the website, what i could and can.
i have the ports open on ipv4 and on ipv6, but the cert keeps failing if i dont uncheck both firewalls...
I also managed to get the website signed externally by choosing the letsencrypt cert on all synology services, FTPS, Synology Drive Server, Synology Storage Console Server and System Default. it now dhows up as a "safe" website