I installed WordPress and let’s encrypt following the quick start guide, however, immediately after setting it up fully the website stops loading.

Let’s Encrypt was set to redirect to https, and there were no errors on the configuration.

Checked https://check-your-website.server-daten.de/?q=todologistics.com and got this:

Wrong redirect one domain http to other domain https. First redirect to https without new dns query, so the server can send the HSTS header. That's fundamental using HSTS (Http Strict Transport Security). First step: Add correct redirects http ⇒ https. Perhaps in your port 80 vHost something like "RewriteEngine on" + "RewriteRule ^ https://%{SERVER_NAME}%{REQUEST_URI} [END,QSA,R=permanent]" (two rows, without the "). Don't add this in your port 443 vHost, that would create a loop. Then recheck your domain, should be Grade C. There is the rule to select one https version as preferred version.

However, apache 2 configs look fine:

<IfModule mod_ssl.c>
<VirtualHost *:443>
        ServerAdmin webmaster@localhost

        ServerName todologistics.com
        ServerAlias www.todologistics.com

        DocumentRoot /var/www/html

        <Directory /var/www/html/>
            Options FollowSymLinks
            AllowOverride All
            Require all granted
        </Directory>

        ErrorLog ${APACHE_LOG_DIR}/error.log
        CustomLog ${APACHE_LOG_DIR}/access.log combined

Include /etc/letsencrypt/options-ssl-apache.conf
SSLCertificateFile /etc/letsencrypt/live/www.todologistics.com/fullchain.pem
SSLCertificateKeyFile /etc/letsencrypt/live/www.todologistics.com/privkey.pem
</VirtualHost>
</IfModule>

# Added to mitigate CVE-2017-8295 vulnerability
UseCanonicalName On

<VirtualHost *:80>
        ServerAdmin webmaster@localhost

        ServerName todologistics.com
        ServerAlias www.todologistics.com

        DocumentRoot /var/www/html

        <Directory /var/www/html/>
            Options FollowSymLinks
            AllowOverride All
            Require all granted
        </Directory>

        ErrorLog ${APACHE_LOG_DIR}/error.log
        CustomLog ${APACHE_LOG_DIR}/access.log combined
RewriteEngine on
RewriteCond %{SERVER_NAME} =www.todologistics.com [OR]
RewriteCond %{SERVER_NAME} =todologistics.com
RewriteRule ^ https://%{SERVER_NAME}%{REQUEST_URI} [END,NE,R=permanent]
</VirtualHost>