devc0n.nl has an A (IPv4) record (92.109.54.16) 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 devc0n.nl/92.109.54.16: Get "http://devc0n.nl/.well-known/acme-challenge/letsdebug-test": context deadline exceeded
Trace:
@0ms: Making a request to http://devc0n.nl/.well-known/acme-challenge/letsdebug-test (using initial IP 92.109.54.16)
@0ms: Dialing 92.109.54.16
@10001ms: Experienced error: context deadline exceeded
A test authorization for devc0n.nl to the Let's Encrypt staging service has revealed issues that may prevent any certificate for this domain being issued.
92.109.54.16: Fetching http://devc0n.nl/.well-known/acme-challenge/WdU0-NmCPedHlj_td4x3GIgmhQ7nu8c9uPtXqxTq9W4: Timeout during connect (likely firewall problem)