My domain is: mail.profilaktika.net
I ran this command: /usr/local/bin/certbot-auto --nginx -d mail.profilaktika.net
It produced this output: Challenge failed for domain mail.profilaktika.net
http-01 challenge for mail.profilaktika.net
Cleaning up challenges
Some challenges have failed.
My web server is (include version): nginx/1.6.2
The operating system my web server runs on is (include version): Debian 8
My hosting provider, if applicable, is:
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): no
The version of my client is (e.g. output of
certbot --version or
certbot-auto --version if you’re using Certbot): certbot 0.33.1
your port 80 doesn't answer ( https://check-your-website.server-daten.de/?q=mail.profilaktika.net ):
If you want to use http-01 validation, an open port 80 and a webserver is required. So a http status 404 - not found should be the answer checking a not existing file in /.well-known/acme-challenge.
Dear JuergenAuer, thank you very much for the hint!
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