This is good plugin for Wordpress against bots and crawlers etc. if it is configured correctly:
Wordfence:
- Blocks fake Google crawlers. These are often robots that are either stealing your content or scanning your site for security holes.
- Blocks anyone that accesses your site too quickly. Very fast scanning is a common heuristic that attack bots share.
- Blocks anyone who is generating page not found errors too quickly. If someone scans your site for security holes, they almost always generate a large number of page not found errors in rapid succession.
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