Blackhole is a WordPress security plugin that detects and traps bad bots in a virtual black hole, where they are denied access to your entire site.
Plugin Tag: bots
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Shield Security – Smart Bot Blocking, Brute-Force Login Protection & File Scanning
Smart WordPress security that blocks bots automatically, guides you to what matters, and repairs problems — without drowning you in noise.
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BBQ Firewall – Fast & Powerful Firewall Security
The fastest firewall plugin for WordPress. Protect against a wide range of threats with minimal performance impact.