525 SSL Handshake Failed

525

SSL Handshake Failed

Example HTTP Response

HTTP Response

HTTP/1.1 525 SSL Handshake Failed
Server: cloudflare
Content-Type: text/html

<html><body>SSL handshake failed</body></html>

Common Causes

Origin server SSL certificate is invalid or expired
Origin doesn't support SSL/TLS on specified port
SSL/TLS version mismatch (origin uses outdated TLS)
Cipher suite incompatibility
Origin certificate is self-signed (with Full Strict mode)
Origin SSL configuration errors
Cloudflare SSL mode set to Full/Full Strict but origin uses HTTP

Technical Details

What does this mean?

Secret handshake failed! Cloudflare and your origin server tried to do the security handshake but couldn't agree on how to do it. It's like two spies who forgot the password.

Technical Definition

Cloudflare could not negotiate an SSL/TLS handshake with the origin server.

Code Snippets

Ready-to-use code for returning this HTTP status in your application:

Node.js

// Express.js
app.get('/example', (req, res) => {
  res.status(525).json({
    error: 'SSL Handshake Failed',
    message: 'Your error message here'
  });
});

// Native HTTP
const http = require('http');

http.createServer((req, res) => {
  res.writeHead(525, { 'Content-Type': 'application/json' });
  res.end(JSON.stringify({
    error: 'SSL Handshake Failed',
    message: 'Your error message here'
  }));
}).listen(3000);

Related Status Codes

🎫495SSL Certificate Error 🎟️496SSL Certificate Required 📜526Invalid SSL Certificate

525 SSL Handshake Failed FAQ

What causes a 525 SSL Handshake Failed error?

Origin server SSL certificate is invalid or expired. Origin doesn't support SSL/TLS on specified port. SSL/TLS version mismatch (origin uses outdated TLS). Cipher suite incompatibility. Origin certificate is self-signed (with Full Strict mode). Origin SSL configuration errors. Cloudflare SSL mode set to Full/Full Strict but origin uses HTTP.

// Express.js app.get('/example', (req, res) => { res.status(525).json({ error: 'SSL Handshake Failed', message: 'Your error message here' }); }); // Native HTTP const http = require('http'); http.createServer((req, res) => { res.writeHead(525, { 'Content-Type': 'application/json' }); res.end(JSON.stringify({ error: 'SSL Handshake Failed', message: 'Your error message here' })); }).listen(3000);

525 SSL Handshake Failed FAQ

What causes a 525 SSL Handshake Failed error?