SSL/TLS & Transport
high Severity
Free Check

SSL Certificate Chain Validation

Checks whether intermediate certificates are properly bundled so mobile and legacy clients can verify trust.

Test Your Website for SSL Certificate Chain Validation

Run this check along with 90+ automated tests across your domain.

Why It Matters

If intermediate certificates are missing, desktop browsers may cache them while mobile devices throw SSL handshake errors.

How We Check This

We inspect the full certificate bundle served during TLS handshake to ensure intermediate CA certificates are present.

How to Fix & Implement

Copy-paste configuration blocks tailored for your web server or edge proxy.

nginx snippet
ssl_certificate /etc/letsencrypt/live/example.com/fullchain.pem; # Use fullchain, not cert.pem

Frequently Asked Questions

Why did my desktop browser work but mobile phone failed?

Desktop browsers often perform AIA fetching to find missing intermediates, whereas mobile browsers do not.