Simply by enabling the plugin can set up a basic auth to dashboard and login page.
More Plugins
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WP Paging Ajax
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Customizer Browser History
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Locus
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Juicy Contact Button
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WP-CommentNavi
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WP Simple SEO Meta
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Fraktjakt WooCommerce Shipping
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Append or Prepend Content
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Geo Blocker – Control Site Access by Region and IP
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USGS Steam Flow Data
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Contact Details
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AWcode Toolkit
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MediaElement Google Analytics & Piwik Event Tracking
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Tracking URL Builder for Analytics
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FuseDesk
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hiWeb Theme Switcher
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XML Sitemap for PDFs for Yoast SEO
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Sync SugarCRM Users
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Guest Support
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bbPress: Auto Delete Spam Replies