eldernode2.ddns.net has an A (IPv4) record (184.108.40.206) but a request to this address over port 80 did not succeed. Your web server must have at least one working IPv4 or IPv6 address.
Get "http://eldernode2.ddns.net/.well-known/acme-challenge/letsdebug-test": dial tcp 220.127.116.11:80: connect: connection refused
@0ms: Making a request to http://eldernode2.ddns.net/.well-known/acme-challenge/letsdebug-test (using initial IP 18.104.22.168)
@0ms: Dialing 22.214.171.124
@84ms: Experienced error: dial tcp 126.96.36.199:80: connect: connection refused
A test authorization for eldernode2.ddns.net to the Let's Encrypt staging service has revealed issues that may prevent any certificate for this domain being issued.
188.8.131.52: Fetching http://eldernode2.ddns.net/.well-known/acme-challenge/rs6pxjXBBKT7EZazO9RdyP8ja3eE3HsRIGU-82ZKcxQ: Connection refused