njds15.ddns.net has an A (IPv4) record (87.123.200.8) 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 njds15.ddns.net/87.123.200.8: Get "http://njds15.ddns.net/.well-known/acme-challenge/letsdebug-test": context deadline exceeded
Trace:
@0ms: Making a request to http://njds15.ddns.net/.well-known/acme-challenge/letsdebug-test (using initial IP 87.123.200.8)
@0ms: Dialing 87.123.200.8
@10000ms: Experienced error: context deadline exceeded
A test authorization for njds15.ddns.net to the Let's Encrypt staging service has revealed issues that may prevent any certificate for this domain being issued.
Fetching http://njds15.ddns.net/.well-known/acme-challenge/8F_Wn4tJeefr8LgMoyPgxMAQduCa3o4LCXi9ee5PjAE: Timeout during connect (likely firewall problem)