AI crawlers are hammering your server
Edge controls alone won't save the origin. nuDefend adds a self-updating hygiene layer on the machine itself — refreshed every 30 minutes — dropping the most aggressive AI crawlers and automated scanners before they burn your resources.
Edge controls live in front of your server — not on it
robots.txt, CDN rules and WAFs sit at the edge and depend on crawlers choosing to obey. The AI bots that matter often ignore them, and your origin stays reachable by IP no matter what the edge says.
Politeness is not enforcement
robots.txt is a request, not a rule. Well-behaved crawlers honour it; the aggressive ones that cost you money simply don't.
Your origin is reachable by IP
Edge controls only help if all traffic passes through them. A crawler that hits your server's IP directly bypasses every edge rule you set.
The real cost is resources, not rights
For a server operator the damage is CPU, bandwidth and database load — not content licensing. That cost is paid on the origin, so that is where it has to be controlled.
Where nuDefend fits
nuDefend runs on the server and drops traffic from known-bad and aggressively-scanning sources at the kernel firewall, before it reaches your application. Its threat intelligence refreshes every 30 minutes, so as new AI crawlers and scanners appear, your protection moves with them.
Always current, always adapting
The AI landscape changes weekly. nuDefend's signed threat lists update automatically every 30 minutes across every protected server, so you are never running last month's defences against this week's crawlers.
Honest about the limits
nuDefend is not a WAF and not volumetric DDoS mitigation. It won't parse every request or absorb a massive flood. What it does is cut the constant background load from known-bad IPs and aggressive scanners at the origin — where you actually pay for it.
Protect the origin, not just the edge
Install nuDefend on any Linux server with a single command and stop paying for traffic you never wanted.