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
@143ms: Server response: HTTP 302 Found
@143ms: Received redirect to https://spaceflight.training
@143ms: Dialing 192.64.119.23
@10001ms: 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
@142ms: Server response: HTTP 302 Found
@142ms: Received redirect to https://spaceflight.training.well-known/acme-challenge/letsdebug-test
A test authorization for spaceflight.training to the Let's Encrypt staging service has revealed issues that may prevent any certificate for this domain being issued.
206.189.217.113: Fetching https://spaceflight.training.well-known/acme-challenge/JbyAysxwCQLZ7qW49I2H0b7OuI-AJbsT-pqnariXmjo: Invalid host in redirect target "spaceflight.training.well-known". Check webserver config for missing '/' in redirect target.