Resolved Not found pages with https version

This should be done

Step 1: configure your configuration.php file

Open your configuration.php file

Find the following line:

var $live_site ='';

Replace with:

var $live_site = 'https://www.your-domain.com';

Next, open .htaccess file then add the following code to the bottom of the file.

RewriteEngine On

RewriteCond %{HTTPS} OFF

RewriteRule (.*) https://%{HTTP_HOST}%{REQUEST_URI}

Step 2: enable Force SSL in your Joomla site

Thank you for your quick reply... but something still not working. The main page is working fine I mean the homepage... but if i choose some downpage still the not found page come up - said for example '/contact' page is not found... and so on...

Did you enable SEF URLS with the URL rewriting in the global configuration?

Yes.