12a.sh has an A (IPv4) record (146.115.132.10) 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 12a.sh/146.115.132.10: Get "http://12a.sh/.well-known/acme-challenge/letsdebug-test": context deadline exceeded
Trace:
@0ms: Making a request to http://12a.sh/.well-known/acme-challenge/letsdebug-test (using initial IP 146.115.132.10)
@0ms: Dialing 146.115.132.10
@10000ms: Experienced error: context deadline exceeded
A test authorization for 12a.sh to the Let's Encrypt staging service has revealed issues that may prevent any certificate for this domain being issued.
Fetching http://12a.sh/.well-known/acme-challenge/Sr_IbRxsA_RMZk2g9HoPaSUOea0Mk-o5dLe7dpG13CU: Timeout during connect (likely firewall problem)