TLS & certificates

Certificate chain trusted by browsers

Certificate validity and trust, key strength and protocol versions.

Why it matters

Browsers and apps refuse the connection or show a warning; some clients silently fail.

How to fix it

Quick fix · under 1 hour

Use a certificate from a public CA (Let's Encrypt is free).
Serve the full chain: configure the 'fullchain' file, not only the leaf certificate.

nginx

ssl_certificate     /etc/letsencrypt/live/example.com/fullchain.pem;
ssl_certificate_key /etc/letsencrypt/live/example.com/privkey.pem;

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How we test it

The check runs from the public internet as part of every scan, read-only and without touching your data. If it fails, your report shows the evidence that proves it - the record, header, file or banner we observed - together with the fix above, tailored to the issue we found.

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