Let's Debug

Test result for www.gnaarl.de using http-01

Debug
Requests made to the domain
Request to: www.gnaarl.de/188.68.60.18, Result: [Address Type=IPv4,Server=Apache/2.4.34,HTTP Status=404], Issue:
Trace:
@0ms: Making a request to http://www.gnaarl.de/.well-known/acme-challenge/letsdebug-test (using initial IP 188.68.60.18)
@0ms: Dialing 188.68.60.18
@174ms: Server response: HTTP 404 Not Found

Debug
A and AAAA records found for this domain
www.gnaarl.de. 0 IN A 188.68.60.18
Challenge update failures for www.gnaarl.de in order https://acme-staging-v02.api.letsencrypt.org/acme/order/5751349/8010900
acme: error code 403 "urn:ietf:params:acme:error:unauthorized": Invalid response from http://www.gnaarl.de/.well-known/acme-challenge/VtWQjdccPHyK7g8AtXrWvCrPXKjzJVzLCp8Ny3jHuC0: "<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN">
<html><head>
<title>404 Not Found</title>
</head><body>
<h1>Not Found</h1>
<p"
Debug
The IANA public suffix is the TLD of the Registered Domain
The TLD for www.gnaarl.de is: de
Debug
The current status.io status for Let's Encrypt
Operational

Submitted Sep 13 20:46:24 2018. Sat in queue for 3ms. Completed in 4s. Hide verbose information.