Thanks for conclusion.
You are right, now everything works good except Redirect Loop for demo.joomlaproduct.com
Though as you know Joomla has administrator subfolder for Back-End. I can open it by demo.joomlaproduct.com/administrator
But demo.joomlaproduct.com brings Redirect Loop. And .htaccess rules don't affect to it. Checked by removing .htaccess for testing result.
Also From Manual I see that domain.vhost files could solve. But I don't imagine how exact
Could you give a hint about that.
Perhaps is happen because httpd- S gives me
*:80 is a NameVirtualHost
default server demo.joomlaproduct.com (/etc/httpd/conf/sites-enabled/demo.joomlaproduct.com.vhost:7)
port 80 namevhost demo.joomlaproduct.com (/etc/httpd/conf/sites-enabled/demo.joomlaproduct.com.vhost:7)
port 80 namevhost demo.wordpressproduct.com (/etc/httpd/conf/sites-enabled/demo.wordpressproduct.com.vhost:7)
port 80 namevhost joomlaproduct.com (/etc/httpd/conf/sites-enabled/joomlaproduct.com.vhost:7)
port 80 namevhost wordpressproduct.com (/etc/httpd/conf/sites-enabled/wordpressproduct.com.vhost:7)
Where an I change default server