Some challenges have failed

The OS is Ubuntu 22.04.

I entered the following command, but I am having trouble with an error. Could you please help me?

sudo apt update
sudo apt install certbot python3-certbot-nginx nginx
sudo systemctl start nginx
sudo systemctl enable nginx
sudo vim /etc/nginx/sites-available/default

I typed the following in Vim

Reloaded Nginx and typed the following command
sudo systemctl reload nginx
sudo certbot --nginx -d

The following error occurred
Hint: The Certificate Authority failed to verify the temporary nginx configuration changes made by Certbot. Ensure the listed domains point to this nginx server and that it is accessible from the internet.

Some challenges have failed.
Ask for help or search for solutions at See the logfile /var/log/letsencrypt/letsencrypt.log or re-run Certbot See the logfile /var/log/letsencrypt/letsencrypt.log or re-run Certbot

Do you own that domain? Does it point to your server?

Please only use,,, *.example if you need example domains.

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To use the --nginx plugin you should have a full server block for HTTP (port 80) in nginx. That one line is not enough.

Something like this is the minimum.

server {
    listen 80;
    listen [::]:80;     # if using IPv6
    root /var/www/html;       # as appropriate for your system

Dear 9peppe san,
Thank you for your message.

Domain is sample not my orijinal domain...
After get SSL Certificate , i will type on browser

Server is X server VPS

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Dear MikeMcQ san,
Thank for your very kindly message!

sudo certbot --nginx -d -d

But result is fail.

Port 22 and 80 is opened.
Firewall is opend.'s DNS is no problem..

Now i don't know wha is root cause of this problem

I will contnue investigate about this problem

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What was the exact error?

It would be easier to help you with your actual domain name

Does the test from this website succeed?


After turning off the packet filter settings, the SSL certificate was issued.

Need i re-setting packet filter settings turn on ?

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