Maintenance Mode – WordPress plugin
Maintenance Mode wordpress plugin allows you to add custom maintenance messages in your wordpress site. Logged in administrators get full access to the blog and visitors will see the custom maintenance message.
1. Download Maintenance Mode wordpress plugin. Download link.
2. Unzip and upload it to your WordPress wp-content/plugins directory.
3. Login to wp-admin. In your admin dashboard click plugins and activate the Maintenance Mode wordpress plugin.
4. Then go to settings menu and click Maintenance Mode.
5. Select Activate and save the options. You can also change the message and various other options.