Simply by enabling the plugin can set up a basic auth to dashboard and login page.
More Plugins
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jQuery Updater
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Simple Aweber Optin Widget
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Contact Form 7 Database Manager Addon – CF7DBM
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Video Popup – Video Lightbox for YouTube, Vimeo & MP4
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Login Dongle
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Robots.txt Editor
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WP Event Calendar
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Geo Data Store
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XML Sitemaps
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Sliding Panel
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Easy Accept Payments via PayPal
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IvyCat AJAX Testimonials
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Requird
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Media Metadata List
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No Category Base (WPML)
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Responsive Menu – Create Mobile-Friendly Menu
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SMTP Mailer
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Cite
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Sticky Add To Cart Bar For WooCommerce
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BuddyPress reCAPTCHA