Cybersecurity

Rate limiting

Capping how many requests a user or IP address can make in a set time.

By Nick Irmo · Updated

What Rate limiting means

Rate limiting slows brute force logins, scraping, form spam and some denial of service attempts. It is set at the server, CDN or application level. Limits should be tuned so real customers are not blocked.

Why it matters for your website

Without limits, bots can hammer your login page, flood your forms with spam or overload your server. Rate limiting slows those attacks down while real visitors barely notice. It helps protect your accounts, keep the site online and control hosting costs.

Example

A ticketing site limits login attempts to a handful per minute per IP address. A bot trying thousands of stolen passwords gets blocked almost immediately.

Tips

  • Add rate limits to login pages, contact forms and password reset pages.
  • Use your host, firewall or CDN settings for rate limiting if you can't code it yourself.
  • Show a friendly message when someone hits a limit, so real users know to wait.

Common mistakes

  • Setting limits so strict that real customers get blocked during busy times.
  • Protecting the login page but leaving APIs and forms wide open.

Questions about Rate limiting

What is Rate limiting?
Capping how many requests a user or IP address can make in a set time.
Does rate limiting stop brute force attacks?
It slows them down a lot, which makes them far less effective. Pair it with strong passwords and MFA for the best protection.
Can rate limiting hurt SEO?
It can if search engine crawlers get blocked. Set limits that allow normal crawling, and check Search Console for crawl errors after changes.

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