UPDATE: Corrected typo in link below.
Hi jsha, thanks for your quick answer.
I have not fixed anything nor have I changed any configuration beyond what was described here: How to stop using TLS-SNI-01 with Certbot .
I’m actually using iptables as a firewall but everyhthing seems to be set correctly there.
In fact, you can try to ping https://bankslash.com/.well-known/acme-challenge/file and you should be able to retrieve it. I have put that file there manually, and I know challenge files are created at the same location. So, I don’t see why challenge files can’t be retrieved in the same way.
What do you think?