Securing your web property with Cloudflare is simpler and faster than many teams realize. With the right Cloudflare Nginx Layer (CNI) patterns, you can lock down core risks in minutes while keeping performance smooth.
This guide delivers quick, practical Cloudflare security tips and tricks tailored around CNI style workflows, so you can protect domains without deep proxy expertise.
| Security Action | Cloudflare Feature | Typical Setup Time | Risk Reduced |
|---|---|---|---|
| Force HTTPS everywhere | Always Use HTTPS | 1–2 minutes | Cleartext interception |
| Filter bad bots and crawlers | Bot Fight Mode & Super Bot Fight | 5–10 minutes | Content scraping & login abuse |
| Rewrite sensitive URLs | Page Rules / Transform Rules | 2–5 minutes | Information leakage via paths |
| Enable TLS 1.3 & modern ciphers | SSL/TS settings | 1 click | Weak protocol exploits |
| Block known attack regions | Country Blocking | 3–5 minutes | Geo-targeted attacks |
Enable Always Use HTTPS And Auto Upgrade
Redirect all incoming traffic to HTTPS with a single toggle in the Cloudflare dashboard. This prevents accidental cleartext requests and pairs cleanly with HSTS headers for long term browser enforcement.
Recommended HSTS Settings
Set a max age of at least 180 days, include subdomains, and preload when you are confident your domain can serve HTTPS universally. This hardens the channel before requests even reach your origin.
Lock Down Bots With Bot Fight Mode
Cloudflare automatically challenges suspicious visitors based on behavior and reputation. Enabling Bot Fight Mode reduces comment spam, credential stuffing, and scraper load with minimal configuration.
Super Bot Fight Mode For Critical Pages
For login, checkout, or admin paths, switch to Super Bot Fight Mode to apply rate limits and interactive challenges, cutting automated abuse without affecting human users.
Harden Encryption And TLS Settings
Modern protocols and strong ciphers lower the likelihood of downgrade attacks and session decryption. Cloudflare defaults are strong, but explicitly preferring TLS 1.3 and AES GCM improves compatibility and security.
Enable Opportunistic Encryption And 0 RTT
Use these only for origins you control and trust, since 0 RTT replay protections are strict. For public APIs or untrusted clients, disable 0 RTT to avoid replay risk.
Apply Smart Transform Rules
Instead of many scattered Page Rules, use Transform Rules to normalize URLs, hide sensitive tokens, and block common exploit patterns directly in the edge proxy.
Create Regex-Based Rules For Sensitive Paths
Block or rewrite paths like /backup, /config, or /phpinfo across your entire zone in one place, reducing noisy 404 entries and accidental exposure.
Filter Traffic By Geography
If your audience is limited to certain countries, block all other regions at the edge. This cuts down noise from known malicious networks and simplifies incident response.
Combine With Rate Limits
Layer country blocking with per-IP rate limits to stop localized flood attacks while keeping legitimate users unaffected in allowed regions.
Core Cloudflare CNI Security Takeaways
- Turn on Always Use HTTPS and set a strong HSTS policy to enforce encrypted connections.
- Enable Bot Fight Mode and configure Super Bot Fight Mode for high risk endpoints.
- Use Transform Rules to hide sensitive URLs and block common exploit paths early.
- Select modern TLS settings with TLS 1.3 and limit 0 RTT to trusted internal flows.
- Apply Country Blocking and per-IP rate limits to shrink the attack surface rapidly.
FAQ
Reader questions
How quickly can I enforce HTTPS site wide on Cloudflare?
Toggle Always Use HTTPS in under two minutes, and observe the change propagate globally within seconds.
Can Bot Fight Mode block scraping without affecting SEO?
Yes, carefully tuned bot controls reduce harmful crawlers while allowing approved search crawlers to index content normally.
Do Transform Rules add noticeable latency to requests?
No, Transform Rules run on Cloudflare’s edge and typically add milliseconds, with optimizations for high throughput.
Should I enable 0 RTT for all APIs behind Cloudflare?
Avoid 0 RTT for public-facing APIs or untrusted clients, since it can expose you to replay attacks; restrict its use to trusted internal services.