Cloudflare SSL/TLS Guide
Establish secure, fast, and search-optimized proxy tunnels.
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Cloudflare SSL/TLS Setup Guide
Configuring SSL/TLS on Cloudflare is essential for securing client connections, boosting mobile PageSpeed via HTTP/3, and maintaining HTTPS ranking equity. Learn how to configure modes without creating infinite redirect loops.
1. Choosing the Correct SSL/TLS Mode
Cloudflare sits as an edge proxy between your visitors and your origin server. It offers four encryption modes:
- Off: No encryption. Connections are plain HTTP. Not recommended.
- Flexible: Encrypts traffic between visitors and Cloudflare, but uses plain HTTP between Cloudflare and your origin server. Caution: This can cause infinite redirect loops if your server forces HTTPS.
- Full: Encrypts connection fully end-to-end, but accepts self-signed certificates on the origin server.
- Full (Strict): Encrypts end-to-end and requires a valid, trusted certificate (like Let's Encrypt) on the origin. Highly Recommended for modern SEO and security compliance.
2. Enabling HSTS & HTTP/3
Under the Edge Certificates tab, enable Always Use HTTPS and configure HSTS (HTTP Strict Transport Security). HSTS instructs browsers to exclusively request HTTPS, eliminating slow redirect hops and securing your page speed score.
Cloudflare SSL Setup Checklist
Install origin certificate
Generate a free origin CA certificate inside Cloudflare or install Let's Encrypt directly on your VPS/Apache server.
Set SSL/TLS to Full (Strict)
Navigate to Cloudflare > SSL/TLS > Overview and update mode to Full (Strict).
Enable HSTS and minTLS
Go to Edge Certificates. Enforce HSTS with a max-age of 1 year, preload, and set Minimum TLS Version to 1.2.
Authoritative Security Resources
To ensure maximum encryption compliance and perform full-chain network diagnostics, we suggest using these official external security standards and verification tools:
Cloudflare Dashboard
Access proxy settings, DNS rules, Turnstile captcha setup, and SSL certificates dashboard.
Qualys SSL Labs Test
Run deep encryption audits, test HSTS parameters, cipher suites, and verify edge protocol trust grade.
Let's Encrypt Authority
Generate and install free, open-source automated SSL/TLS credentials on origin servers.
Mozilla SSL Config Generator
Generate optimized, secure server profiles and cipher directives for Apache, Nginx, and HAProxy.
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