One of the Mura CMS best practices is to not use the "default"-site, but at the same time there is no way to make the site unavailable to your visitors. Until now... 

disableSite is a simple Mura CMS plugin that disables a site. Just activate the plugin on the site(s) you want to disable and disableSite will forward the visitor to your main site. But when loggedin as a super administrator your site will work as expected.

You can download disableSite from GitHub, RIAForge or the Mura CMS Marketplace. And like always, if you have questions, remarks, request, ... you know where to find me!