I reset my server with ssl certificate on this

[rg305]

Ok here are the two main entries:

1. the creation of the challenge response file:

2021-09-17 19:29:10,992:DEBUG:certbot._internal.plugins.webroot:Attempting to save validation to 
/var/www/site/.well-known/acme-challenge/Qc3j6Z4o2-HiBakpjMroKEFD6nU4t-195C7nSM_4dHo

2. The validation request (that failed):

"detail": "Invalid response from http://danstoncubemc.com/.well-known/acme-challenge/Qc3j6Z4o2-HiBakpjMroKEFD6nU4t-195C7nSM_4dHo [141.94.96.56]: \"\u003c!DOCTYPE html\u003e\\n\u003chtml lang=\\\"fr\\\"\u003e\\n\u003chead\u003e\\n    \u003cmeta charset=\\\"utf-8\\\"\u003e\\n    \u003cmeta name=\\\"viewport\\\" content=\\\"width=device-width, initia\"",

We need to find out why it fails and fix it.
First we need to simulate a challenge file.
[do these three steps]
mkdir /var/www/site/.well-known
mkdir /var/www/site/.well-known/acme-challenge
echo TestFile1234 > /var/www/site/.well-known/acme-challenge/Test-File-1234

Then we test it with:
http://danstoncubemc.com/.well-known/acme-challenge/Test-File-1234

[HyG0View]

@rg305

[do these three steps]
mkdir /var/www/site/.well-known
mkdir /var/www/site/.well-known/acme-challenge
echo TestFile1234 > /var/www/site/.well-known/acme-challenge/Test-File-1234

Okok, I make step by step this and I test http://danstoncubemc.com/.well-known/acme-challenge/Test-File-1234. I got 404 error. I think it's maybe the .htaccess of rewrite mode do this.
The .htaccess of my website is :

<IfModule mod_rewrite.c>

    <IfModule mod_negotiation.c>

        Options -MultiViews

    </IfModule>

    RewriteEngine On

    # Handle Authorization Header

    RewriteCond %{HTTP:Authorization} .

    RewriteRule .* - [E=HTTP_AUTHORIZATION:%{HTTP:Authorization}]

    RewriteCond %{REQUEST_FILENAME} -d [OR]

    RewriteCond %{REQUEST_FILENAME} -f

    RewriteRule ^ ^$1 [N]

    RewriteCond %{REQUEST_URI} (\.\w+$) [NC]

    RewriteRule ^(.*)$ public/$1

    RewriteCond %{REQUEST_FILENAME} !-d

    RewriteCond %{REQUEST_FILENAME} !-f

    RewriteRule ^ server.php

</IfModule>

I don't know if this can help you but you got.

[HyG0View]

@HyG0View

http://danstoncubemc.com/.well-known/acme-challenge/Test-File-1234

Up! I disabled the Rewrite Engine and I get a blank page with "TestFile1234"
Maybe the .htaccess is the mistake ?

[rg305]

@HyG0View

Maybe the .htaccess is the mistake ?

I think so.
I'm not too familiar with .htaccess files; and this one does a bit more than usual.

[rg305]

This:

@HyG0View

    RewriteCond %{HTTP:Authorization} .
    RewriteRule .* - [E=HTTP_AUTHORIZATION:%{HTTP:Authorization}]

Seems to be conflicted by this:

@HyG0View

    RewriteCond %{REQUEST_URI} (\.\w+$) [NC]
    RewriteRule ^(.*)$ public/$1

and this:

@HyG0View

    RewriteCond %{REQUEST_FILENAME} -d [OR]
    RewriteCond %{REQUEST_FILENAME} -f
    RewriteRule ^ ^$1 [N]

Where did you get that .htaccess file?

[HyG0View]

@rg305

Where did you get that .htaccess file?

I get this .htaccess at /var/www/site (the root of my website)
He was created with the CMS what I'm using.

@rg305

Seems to be conflicted by this:

@HyG0View

>     RewriteCond %{REQUEST_URI} (\.\w+$) [NC]
    RewriteRule ^(.*)$ public/$1
> ```

and this:

Okok, what can I have to do for resolve that ?

[rg305]

@HyG0View

what can I have to do for resolve that ?

I don't know about what the CMS needs, so I can't say for that.
But for LE to work, I think you don't need any of that file.