I’d like to implement letsencrypt for my local network behind a Fritz!Box. I have a dynamic IP and use dynamic DNS for domain name.
The problem: fritzbox captures the 443 port. If I change this (just for sign-up purposes), I would probably be able to get a certificate (forward 443 to local client running certbot) and later add the certificate to the fritzbox as well.
However, I do not see how that would survive the renewal process?
My goal would be to
a) use single certificate for fritzbox UI on 443 and other services on different ports and
b) renew those certificates automatically
Is that possible?