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: http://pdede.sch.gr/
I ran this command: sudo certbot --apache
It produced this output: Which names would you like to activate HTTPS for?
1: pdede2.sch.gr
Select the appropriate numbers separated by commas and/or spaces, or leave input
blank to select all options shown (Enter 'c' to cancel): 1
Renewing an existing certificate for pdede2.sch.gr
Certbot failed to authenticate some domains (authenticator: apache). The Certificate Authority reported these problems:
Domain: pdede2.sch.gr
Type: dns
Detail: DNS problem: NXDOMAIN looking up A for pdede2.sch.gr - check that a DN S record exists for this domain
Hint: The Certificate Authority failed to verify the temporary Apache configuration changes made by Certbot. Ensure that the listed domains point to this Apache server and that it is accessible 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 mo re details.
My web server is (include version):
The operating system my web server runs on is (include version): Ubuntu Linux 18.04.1
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):
The version of my client is (e.g. output of certbot --version or certbot-auto --version if you're using Certbot):
see also: https://check-your-website.server-daten.de/?i=f50929fe-e820-40a4-8406-318dac2aa828