I am trying to obtain a certificate but am facing a timeout error.
It’s my first time doing this and I am trying to follow this tutorial https://www.digitalocean.com/community/tutorials/how-to-use-certbot-standalone-mode-to-retrieve-let-s-encrypt-ssl-certificates on a fresh Ubuntu 16.04 installation.
I have enabled port 80 and 443 traffic:
sudo ufw status numbered
To Action From
-- ------ ----
[ 1] 80 ALLOW IN Anywhere
[ 2] 443 ALLOW IN Anywhere
[ 3] 22 ALLOW IN Anywhere
[ 4] 80 (v6) ALLOW IN Anywhere (v6)
[ 5] 443 (v6) ALLOW IN Anywhere (v6)
[ 6] 22 (v6) ALLOW IN Anywhere (v6)
My domain is:
I ran this command: sudo certbot certonly --standalone --preferred-challenges tls-sni -d
It produced this output: Saving debug log to /var/log/letsencrypt/letsencrypt.log
Plugins selected: Authenticator standalone, Installer None
Obtaining a new certificate
Performing the following challenges:
tls-sni-01 challenge for
Waiting for verification…
Cleaning up challenges
Failed authorization procedure. (tls-sni-01): urn:acme:error:connection :: The server could not connect to the client to verify the domain :: Timeout
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.
The operating system my web server runs on is (include version): Ubuntu 16.04
I can login to a root shell on my machine (yes or no, or I don’t know): yes
Any idea what may be going wrong?