On this tab, you can make the currently edited site unavailable for regular users.
This is performed using the Take the site off-line button. Even though the live version will not be accessible, the site will still remain running and can be worked with normally through the CMS Desk or Site Manager interface. This can be useful if you need to make major modifications to the site and wish to hide it while the update is in progress.
You can choose between two ways of handling users who attempt to access the site while it is off-line. Either select Display following message and add some content using the WYSIWYG editor that will be displayed to visitors or use Redirect visitor to following URL and enter the address of an alternate website or page to which users will automatically be redirected until the site is returned back on-line.
At any time, you can allow visitors to access the site again by clicking the Bring the site on-line button.
More resources can be found in:
Page url: http://devnet.kentico.com/docs/6_0/contexthelp/index.html?offline_mode_tab.htm