gschmidt.duckdns.org has an A (IPv4) record (84.28.65.36) but a request to this address over port 80 did not succeed.
Get http://gschmidt.duckdns.org/.well-known/acme-challenge/letsdebug-test: dial tcp 84.28.65.36:80: connect: connection refused
Trace:
@0ms: Making a request to http://gschmidt.duckdns.org/.well-known/acme-challenge/letsdebug-test (using initial IP 84.28.65.36)
@0ms: Dialing 84.28.65.36
@89ms: Experienced error: dial tcp 84.28.65.36:80: connect: connection refused
A test authorization for gschmidt.duckdns.org to the Let's Encrypt staging service has revealed issues that may prevent any certificate for this domain being issued.
Fetching http://gschmidt.duckdns.org/.well-known/acme-challenge/CdslvXyri-Kz6CGpTqWFuJhg9AZUX0xXUeHOslNZZyQ: Connection refused