Resolution
To fix it, move sitebuilder.conf:mv /etc/httpd/conf.d/sitebuilder.conf /etc/httpd/conf/and add the "Include sitebuilder.conf" line into /etc/httpd/conf/httpd.conf right after "Include httpd.include" line. It should be like:
Include httpd.include
Include sitebuilder.conf
Then restart apache.
Keywords: Sitebuilder, default page, ip, default domain