715database.com has an A (IPv4) record (220.127.116.11) 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 715database.com/18.104.22.168: Get "http://715database.com/.well-known/acme-challenge/letsdebug-test": context deadline exceeded
@0ms: Making a request to http://715database.com/.well-known/acme-challenge/letsdebug-test (using initial IP 22.214.171.124)
@0ms: Dialing 126.96.36.199
@10000ms: Experienced error: context deadline exceeded
A test authorization for 715database.com to the Let's Encrypt staging service has revealed issues that may prevent any certificate for this domain being issued.
188.8.131.52: Fetching http://715database.com/.well-known/acme-challenge/BThD_VlW159fgQHoXFEddjv9TUv-Uv-LuFcn7d1AFSU: Timeout during connect (likely firewall problem)