Should I expect caddy to stop working when my certificate expires? Does it mean there’s an issue when renewing my certificate? What should I do to help caddy?
What version of Caddy are you using? What is the domain name? (Edit: to clarify I’m mobile so I can’t look up your domain from the authz url right now but otherwise I would as it should reveal the domain name, which will make it easier to debug)
Another possibility is to use DNS validation for the certificate, in which case you don’t need to open any ports at all. You do, however, need to be using a supported DNS provider–Cloudflare is popular, but many other DNS hosts are supported as well. See the list in the docs (scroll down the the heading for DNS providers on the left).