Please fill out the fields below so we can help you better. Note: you must provide your domain name to get help. Domain names for issued certificates are all made public in Certificate Transparency logs (e.g. crt.sh | example.com), so withholding your domain name here does not increase secrecy, but only makes it harder for us to provide help.
My domain is: instatech.network mail.instatech.network
I ran this command: certbot certonly --webroot -w /var/www/html/ -d instatech.network -d mail.instatech.network
It produced this output:
Saving debug log to /var/log/letsencrypt/letsencrypt.log
Requesting a certificate for instatech.network and mail.instatech.network
Certbot failed to authenticate some domains (authenticator: webroot). The Certificate Authority reported these problems:
Detail: 2606:4700:3034::ac43:85ef: Invalid response from https://mail.instatech.network/.well-known/acme-challenge/NeeXoDQZiAJElrcjSY3P69-Zgi8N6eobP7xrTbI6ct0: 526
Detail: 2606:4700:3032::6815:5e2: Invalid response from https://instatech.network/.well-known/acme-challenge/NsHrPUHZky3tnvOYgmMz88ysKyISAqeoJHFQ2iboM5Y: 526
Hint: The Certificate Authority failed to download the temporary challenge files created by Certbot. Ensure that the listed domains serve their content from the provided --webroot-path/-w and that files created there can be downloaded from the internet.
Some challenges have failed.
Ask for help or search for solutions at https://community.letsencrypt.org. See the logfile /var/log/letsencrypt/letsencrypt.log or re-run Certbot with -v for more details.
My web server is (include version): nginx 1.18.0
The operating system my web server runs on is (include version): Ubuntu 22.04 LTS
My hosting provider, if applicable, is: IONOS
I can login to a root shell on my machine (yes or no, or I don't know): yes
I'm using a control panel to manage my site (no, or provide the name and version of the control panel):
I'm using the built-in website management to manage my site
The version of my client is (e.g. output of
certbot --version or
certbot-auto --version if you're using Certbot): certbot 1.28.0
I have a feeling that the reason certbot cannot download the temp challenge file is because I'm going through Cloudflare DNS. I could be horribly wrong here as this is my first time using the app.