linkdev.langlo.no has an A (IPv4) record (81.26.52.147) 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://linkdev.langlo.no/.well-known/acme-challenge/letsdebug-test": read tcp 172.104.24.29:33346->81.26.52.147:80: read: connection reset by peer
Trace:
@0ms: Making a request to http://linkdev.langlo.no/.well-known/acme-challenge/letsdebug-test (using initial IP 81.26.52.147)
@0ms: Dialing 81.26.52.147
@199ms: Experienced error: read tcp 172.104.24.29:33346->81.26.52.147:80: read: connection reset by peer
A test authorization for linkdev.langlo.no to the Let's Encrypt staging service has revealed issues that may prevent any certificate for this domain being issued.
Fetching http://linkdev.langlo.no/.well-known/acme-challenge/VsTe9FGae1H8hbXFv7SAmMM3pDPODh0XtGOttQAWnD4: Connection reset by peer