biggszm.duckdns.org has an A (IPv4) record (174.66.232.64) 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 biggszm.duckdns.org/174.66.232.64: Get "http://biggszm.duckdns.org/.well-known/acme-challenge/letsdebug-test": context deadline exceeded
Trace:
@0ms: Making a request to http://biggszm.duckdns.org/.well-known/acme-challenge/letsdebug-test (using initial IP 174.66.232.64)
@0ms: Dialing 174.66.232.64
@10000ms: Experienced error: context deadline exceeded
A test authorization for biggszm.duckdns.org to the Let's Encrypt staging service has revealed issues that may prevent any certificate for this domain being issued.
Fetching http://biggszm.duckdns.org/.well-known/acme-challenge/ajqq4L_HEJFX78nS0dme4abPsj6QMh66fAg-vChFgWA: Timeout during connect (likely firewall problem)