I am not sure what to make of this.
I have had lets encrypt certs for a while now. Most of them were obtained before I set up OPNSense so I was still behind a fortigate. I went to add one to my reverse proxy server and it keeps failing the challenge. I can access the site without issues, on port 80, but for some reason, I see in the firewall logs that the requests to port 80 from the lets encrypt servers are being blocked.
Has anyone else had something similar?
Can you shed more light on your setup?
Probably related to this:
https://community.certifytheweb.com/t/info-lets-encrypt-validation-failures-for-http-domain-validation/2209