ma7gdp.duckdns.org has an A (IPv4) record (88.111.245.50) 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://ma7gdp.duckdns.org/.well-known/acme-challenge/letsdebug-test": dial tcp 88.111.245.50:80: connect: connection refused
Trace:
@0ms: Making a request to http://ma7gdp.duckdns.org/.well-known/acme-challenge/letsdebug-test (using initial IP 88.111.245.50)
@0ms: Dialing 88.111.245.50
@89ms: Experienced error: dial tcp 88.111.245.50:80: connect: connection refused
A test authorization for ma7gdp.duckdns.org to the Let's Encrypt staging service has revealed issues that may prevent any certificate for this domain being issued.
88.111.245.50: Fetching http://ma7gdp.duckdns.org/.well-known/acme-challenge/8Wy5qccbTmasEJkkFcfLo2u-Zuwsl4R7qusJ4_IwMC0: Connection refused