Failing to create certificate behind Cloudflare CDN

My domain is: strafebink.io

I ran this command: certbot certonly --config "/etc/letsencrypt.ini" --cert-name "npm-10" --agree-tos --authenticator webroot --email "contact@REDACTED.com.au" --preferred-challenges "dns,http" --domains "vaultwarden.strafebink.io"

It produced this output: See attached log output

My web server is (include version): Unknown

The operating system my web server runs on is (include version): Unraid

My hosting provider, if applicable, is: N/A

I can login to a root shell on my machine (yes or no, or I don't know): Yes

The version of my client is (e.g. output of certbot --version or certbot-auto --version if you're using Certbot): certbot._internal.main:certbot version: 1.21.0

log.txt (21.0 KB)

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Welcome to the forum @StrafeBink

You are using Cloudflare CDN and looks like Cloudflare got a certificate for you. See here. They used Let's Encrypt to issue this cert.

That certificate is used for connections between a client (like a browser) and the Cloudflare edge. This is working fine with https and is secure. You have a problem between your server and the Cloudflare edge which explains the 502 Gateway error you see. You should probably setup a Cloudflare Origin CA certificate for use between your server and Cloudflare. This will be easier than using certbot to create one for that purpose.

https://developers.cloudflare.com/ssl/origin-configuration/origin-ca

Here is some more background on Cloudflare's Origin CA

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