spaceflight.training has an A (IPv4) record (206.189.217.113) 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.
Get "http://spaceflight.training/.well-known/acme-challenge/letsdebug-test": dial tcp 206.189.217.113:80: connect: connection refused
Trace:
@0ms: Making a request to http://spaceflight.training/.well-known/acme-challenge/letsdebug-test (using initial IP 206.189.217.113)
@0ms: Dialing 206.189.217.113
@70ms: Experienced error: dial tcp 206.189.217.113:80: connect: connection refused