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:
I ran this command: sudo certbot certonly --standalone -d optimate.wenbinzhao.com
It produced this output:
Saving debug log to /var/log/letsencrypt/letsencrypt.log
Plugins selected: Authenticator standalone, Installer None
Requesting a certificate for optimate.wenbinzhao.com
Performing the following challenges:
http-01 challenge for optimate.wenbinzhao.com
Waiting for verification...
Challenge failed for domain optimate.wenbinzhao.com
http-01 challenge for optimate.wenbinzhao.com
Cleaning up challenges
Some challenges have failed.
IMPORTANT NOTES:
-
The following errors were reported by the server:
Domain: optimate.wenbinzhao.com
Type: dns
Detail: No valid IP addresses found for optimate.wenbinzhao.com
My web server is (include version): standalone
The operating system my web server runs on is (include version): Ubuntu 20.04
My hosting provider, if applicable, is: local
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 1.13.0
Additional notes: I'm using a subdomain for a project in testing; I added an A Record pointing to the IP of the machine I'm testing the server on.