waternlava.duckdns.org has an A (IPv4) record (172.97.186.223) 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.
A timeout was experienced while communicating with waternlava.duckdns.org/172.97.186.223: Get "http://waternlava.duckdns.org/.well-known/acme-challenge/letsdebug-test": dial tcp 172.97.186.223:80: i/o timeout
Trace:
@0ms: Making a request to http://waternlava.duckdns.org/.well-known/acme-challenge/letsdebug-test (using initial IP 172.97.186.223)
@0ms: Dialing 172.97.186.223
@10000ms: Experienced error: dial tcp 172.97.186.223:80: i/o timeout
A test authorization for waternlava.duckdns.org to the Let's Encrypt staging service has revealed issues that may prevent any certificate for this domain being issued.
Fetching http://waternlava.duckdns.org/.well-known/acme-challenge/jdJJmRWa8mM45lIIeJJjOSM97osRT6C0as7Tj217-VE: Timeout during connect (likely firewall problem)