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letsdebug
Diagnostic tool/website to help figure out why you can't issue a certificate for Let's Encrypt
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
What does letsdebug show? Go to https://letsdebug.net ? Put in your domain name and hit run test
Are you running this server at your house? If so, I would proxy the service behind something like Cloudflare. They give plenty of how-to articles on how to implement their FREE service. You can then run this service as a secure connection (HTTPS) to Cloudflare and then insecure (HTTP) to your home server, this will eliminate the need to do the Let's Encrypt thing unless you need the full chain of security to your home.