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525 5xx Cloudflare custom

SSL Handshake Failed

Cloudflare-specific. SSL handshake with origin failed.

What HTTP 525 means

Cloudflare 525: SSL/TLS handshake between Cloudflare and origin failed. Common causes: origin SSL cert expired, hostname mismatch, unsupported TLS version, Full (strict) SSL mode without valid origin cert.

Typical causes

  • Origin SSL cert expired
  • Hostname mismatch
  • Unsupported TLS version
  • Full (strict) mode without valid cert