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My domain is: line28.com
It produced this output:
Saving debug log to /var/log/letsencrypt/letsencrypt.log
Obtaining a new certificate
Performing the following challenges:
tls-sni-01 challenge for line28.com
tls-sni-01 challenge for www.line28.com
Waiting for verification…
Cleaning up challenges
Failed authorization procedure. line28.com (tls-sni-01): urn:acme:error:connection :: The server could not connect to the client to verify the domain :: DNS problem: SERVFAIL looking up A for line28.com, www.line28.com (tls-sni-01): urn:acme:error:connection :: The server could not connect to the client to verify the domain :: DNS problem: SERVFAIL looking up A for www.line28.com
The following errors were reported by the server:
To fix these errors, please make sure that your domain name was
entered correctly and the DNS A/AAAA record(s) for that domain
contain(s) the right IP address. Additionally, please check that
your computer has a publicly routable IP address and that no
firewalls are preventing the server from communicating with the
client. If you’re using the webroot plugin, you should also verify
that you are serving files from the webroot path you provided.
My web server is (include version):
Apache/2.4.18 (Ubuntu) server built: 2017-07-27T14:34:01
The operating system my web server runs on is (include version):
DISTRIB_DESCRIPTION="Ubuntu 16.04.3 LTS"
VERSION="16.04.3 LTS (Xenial Xerus)"
PRETTY_NAME="Ubuntu 16.04.3 LTS"
My hosting provider, if applicable, is:
I can login to a root shell on my machine (yes or no, or I don’t know):
I’m using a control panel to manage my site (no, or provide the name and version of the control panel):