I am since quite some time using the linuxserver/letsencrypt container running on a Synology DS716+II.
In my router (asus wrt merlin) i am forwarding 80/443/tcp to my NAS where the container is running on -p 80:80 and
-p 443:443 (i have changed the ports for the Synology nginx server to other ports).
I have a domain hosted with cloudns.net with a number of a records updated using ddns
double checked that all points to the actual external IP of my router.
I have had the setup running with 3 subdomains nextcloud, bitwarden, gogs and the container
when started with docker-compose up -d successfully create certificate for all 3 without problems.
Now comes the problem, i want to add a 4th subdomain, but now all of a sudden the verification
is failing randomly for each of the subdomains.
Some times 2 are created and for 2 verification fails, sometimes 3 are created and 1 verification fail.
As you can see the port mapping setup is correct and working (if not then 3 subdomains would not work either!) but for some reason it seems that multiple simultaneous requests for verification above
3 seems to fail.
Is this a known problem? Or is there any other way to configure this so that i can use +3 certificates?
Ex. wildcard cert or similar?