extunibusbooking.com has an A (IPv4) record (88.222.221.26) 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 extunibusbooking.com/88.222.221.26: Get "http://extunibusbooking.com/.well-known/acme-challenge/letsdebug-test": context deadline exceeded
Trace:
@0ms: Making a request to http://extunibusbooking.com/.well-known/acme-challenge/letsdebug-test (using initial IP 88.222.221.26)
@0ms: Dialing 88.222.221.26
@10001ms: Experienced error: context deadline exceeded
A test authorization for extunibusbooking.com to the Let's Encrypt staging service has revealed issues that may prevent any certificate for this domain being issued.
88.222.221.26: Fetching http://extunibusbooking.com/.well-known/acme-challenge/xjpxHXOgYPMF-hdorpUVXPoFCPRbQItlYiZ1uO2pT0Q: Timeout during connect (likely firewall problem)