In some cases, you might need to configure some extra settings on your website so that it opens with https. For example, in WordPress, you must carry out two extra steps after having enabled Let's Encrypt in Plesk.
1. htaccess settings:
In Plesk, from the menu on the left, select Files. In your root folder, search the file .htaccess and open it, in order to edit it with the following code.
If you cannot find it, create a file with this name and upload it to your root folder. Next, you must enter the following code in the file, wherever this code appears as shown on the following image:
RewriteCond %{HTTPS} off
RewriteRule (.*) https://%{HTTP_HOST}%{REQUEST_URI} [R,L]
2. Settings in WordPress
Log into the WordPress administrative environment, click on Settings and then General at the bottom of the menu on the left. You must add an s in the fields WordPress Address (URL) and Site Address (URL), in order to change http into https.
Note: If you download WordPress using Plesk and you wish to activate Let's encrypt, when downloading WordPress, select https instead of http.