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.
It produced this output:
Saving debug log to /var/log/letsencrypt/letsencrypt.log
Plugins selected: Authenticator apache, Installer apache
Cert is due for renewal, auto-renewing...
Renewing an existing certificate
Performing the following challenges:
http-01 challenge for sendy.ventefidelite.com
Waiting for verification...
Challenge failed for domain sendy.ventefidelite.com
http-01 challenge for sendy.ventefidelite.com
Cleaning up challenges
Some challenges have failed.
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 HTTP Server 2.4.41
The operating system my web server runs on is (include version): Ubuntu 20.04.4 LTS
My hosting provider, if applicable, is: Digital ocean
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 0.40.0
Hi @mmazraani and welcome to the community!
Your error response says LE Servers are trying to connect to your server on port 80 (http)
When checking your IP it looks like port 80 is being "filtered" and therefore is is not allowing LetsEncrypt to validate your system.
AH00558: apache2: Could not reliably determine the server's fully qualified domain name, using 127.0.1.1. Set the 'ServerName' directive globally to suppress this message
VirtualHost configuration:
*:443 is a NameVirtualHost
default server sendy.ventefidelite.com (/etc/apache2/sites-enabled/000-default-le-ssl.conf:2)
port 443 namevhost sendy.ventefidelite.com (/etc/apache2/sites-enabled/000-default-le-ssl.conf:2)
port 443 namevhost 159.203.4.211 (/etc/apache2/sites-enabled/159.203.4.211.conf:1)
*:80 is a NameVirtualHost
default server 127.0.1.1 (/etc/apache2/sites-enabled/000-default.conf:1)
port 80 namevhost 127.0.1.1 (/etc/apache2/sites-enabled/000-default.conf:1)
port 80 namevhost 159.203.4.211 (/etc/apache2/sites-enabled/159.203.4.211.conf:9)
Digital Ocean is primarily a self-serve VPS provider. In case they cannot provide sufficient detail, here are some DO guides that pertain to both the firewall running in your Droplet's operating system and the DO Cloud Firewall.