Custom Caddy Docker image with Cloudflare DNS challenge support Configure a custom Caddy Docker image to use Cloudflare’s DNS challenge, securing HTTPS without exposing ports 80/443, ideal for firewall, CGNAT, and load-balancer setups.

So, it appears you also need to #Cloudflare DNS Challenge configuration in your #Caddyfile if you're using Cloudflare access policy for your service: deuts.org/p/caddy-dock... #Caddy