Jordan Patterson

Redirects any unauthenticated users to another url and sends them a ‘302 Moved Temporarily’ status. 
Ideal for sites that are under development especially if the site is being moved or currently has an older version. 
Adds an item to the ‘Options’ menu on the admin panel where you can enter the site you want to redirect users to.

302 Moved Temporarily

Need to redirect your visitors temporarily? This plugin will redirect any unauthenticated users to another url and still allow logged in users to use  …

Robert Wetzlmayr

This simple and lightweight WordPress maintenance plugin puts the site into maintenance mode by sending a ‘503 Service Unavailable’ status to all unauthenticated clients.
Thus it effectively inhibits search engines from both losing your site’s existing content and indexing your maintenance page as well, so your site will not lose its rankings while it is out of service.
Content will even be hidden from consumers of the site’s RSS or Atom feeds.
Please refer to the <a href="http://talkpress.de/blip/wet-maintenance-wordpress-plugin" rel="nofollow ugc">WordPress Maintenance Plugin</a> article for additional information.

Site Maintenance

Puts the site into maintenance mode by sending a '503 Service Unavailable' status to all unauthenticated clients.

302 Moved Temporarily vs Site Maintenance