How to block bad bots User-Agents in Nginx
To block bots by User-Agent in Nginx, add the following to the server entry of the website.
if ($http_user_agent ~ (semrush|opensiteexplorer|ahrefs|seekport|mj12bot)) { return 403; }
Restart Nginx
systemctl restart nginx
To block acces to a specific file or folder, use
location /file-to-block.php { return 408; }
If you are using Apache web server, see How to block Bad Bots (User Agents) using .htaccess or Block User-Agent using Cloudflare
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