gollum.at has an A (IPv4) record (80.64.140.85) 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://gollum.at/.well-known/acme-challenge/letsdebug-test": dial tcp 80.64.140.85:80: connect: connection refused
Trace:
@0ms: Making a request to http://gollum.at/.well-known/acme-challenge/letsdebug-test (using initial IP 80.64.140.85)
@0ms: Dialing 80.64.140.85
@102ms: Experienced error: dial tcp 80.64.140.85:80: connect: connection refused
An internal error occurred while checking the domain
An unknown issue occurred when performing a test authorization against the Let's Encrypt staging service: acme: parsing error body: invalid character '<' looking for beginning of value - <html>
<head><title>405 Not Allowed</title></head>
<body>
<center><h1>405 Not Allowed</h1></center>
<hr><center>nginx</center>
</body>
</html>
The current status as reported by the Let's Encrypt status page is Service Disruption as at 2022-10-20 18:58:23.753 +0000 UTC. Depending on the reported problem, this may affect certificate issuance. For more information, please visit the status page.
https://letsencrypt.status.io/