schuldenuhren.net has an A (IPv4) record (87.171.216.2) 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://schuldenuhren.net/.well-known/acme-challenge/letsdebug-test": dial tcp 87.171.216.2:80: connect: connection refused
Trace:
@0ms: Making a request to http://schuldenuhren.net/.well-known/acme-challenge/letsdebug-test (using initial IP 87.171.216.2)
@0ms: Dialing 87.171.216.2
@103ms: Experienced error: dial tcp 87.171.216.2:80: connect: connection refused
A test authorization for schuldenuhren.net to the Let's Encrypt staging service has revealed issues that may prevent any certificate for this domain being issued.
87.171.216.2: Fetching http://schuldenuhren.net/.well-known/acme-challenge/dQemUuoHW9tTbEwpnR7_q7cGPNL8fY85yIpG6SL6ZX0: Connection refused