spaceflight.training has an A (IPv4) record (192.64.119.23) 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 spaceflight.training/192.64.119.23: Get "https://spaceflight.training": context deadline exceeded
Trace:
@0ms: Making a request to http://spaceflight.training/.well-known/acme-challenge/letsdebug-test (using initial IP 192.64.119.23)
@0ms: Dialing 192.64.119.23
@144ms: Server response: HTTP 302 Found
@144ms: Received redirect to https://spaceflight.training
@144ms: Dialing 192.64.119.23
@10000ms: Experienced error: context deadline exceeded
Sending an ACME HTTP validation request to spaceflight.training results in an unacceptable redirect. This is most likely a misconfiguration of your web server or your web application.
It appears that a redirect was generated by your web server that is missing a trailing slash after your domain name: https://spaceflight.training.well-known/acme-challenge/letsdebug-test. Check your web server configuration and .htaccess for Redirect/RedirectMatch/RewriteRule.
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
@139ms: Server response: HTTP 302 Found
@139ms: Received redirect to https://spaceflight.training.well-known/acme-challenge/letsdebug-test