cbs_maintenance_mode
Takes the public website offline with a custom message and shows a warning in the admin interface
This plugin is a modified version of rvm_maintenance. It allows you to take the entire public website offline for maintenance in a few clicks. Anyone attempting to access the public part of the website will then see in the default HTTP 503 Textpattern error template instead, including a custom message of your choice. A warning message will be shown in the admin interface as long as the website is in maintenance mode.