Hint: The Certificate Authority failed to verify the temporary nginx configuration changes made by Certbot. Ensure the listed domains point to this nginx server and that it is accessible from the internet.
Yes I did the ddns in my OpenWrt and the linux servers are on subnets, I set the port forwarding in OpenWrt ,but when i add the port in my domain Certbot can't ip, What should I do to get Certbot to find linux.