jbd.duckdns.org has an A (IPv4) record (178.39.188.67) 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://jbd.duckdns.org/.well-known/acme-challenge/letsdebug-test": dial tcp 178.39.188.67:80: connect: connection refused
Trace:
@0ms: Making a request to http://jbd.duckdns.org/.well-known/acme-challenge/letsdebug-test (using initial IP 178.39.188.67)
@0ms: Dialing 178.39.188.67
@97ms: Experienced error: dial tcp 178.39.188.67:80: connect: connection refused
A test authorization for jbd.duckdns.org to the Let's Encrypt staging service has revealed issues that may prevent any certificate for this domain being issued.
Fetching http://jbd.duckdns.org/.well-known/acme-challenge/F1QuknF4sLUrOzeSRy5MbTUDJIaJRIeq9g1eMCQl-iw: Connection refused