What's My Chain Cert?

In plain words

What's My Chain Cert? is a diagnostic tool that helps website owners verify their SSL certificate chain configuration. It checks whether the correct intermediate certificates are installed alongside a site's primary SSL certificate, identifying misconfigurations that can cause browser errors and inconsistent behavior across different browsers. The tool addresses a common problem where improperly configured chains work in some browsers but fail in others, making debugging difficult for site administrators managing SSL certificate installations and renewals.

written from the facts on this page · September 2026

From the sources

Did you know that when you install an SSL certificate, you have to install not only your site's certificate, but also one or more intermediate (a.k.a. chain) certificates? Failure to install the correct chain can cause certificate errors in browsers, driving visitors away from your site. To complicate matters, some browsers cache intermediate certificates, or download missing intermediates on-demand, meaning that an improperly-configured chain could work in some browsers but not others, making this an annoying problem to debug. Plus, when you renew your certificate, you might need to install new intermediate certificates. This site tests if your server is serving the correct certificate…from whatsmychaincert.com

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