Browser Certificate Errors

This collection is designed for browser problems that revolve around secure identity, certificate trust, validity windows, hostname mismatches, and TLS-related trust warnings. These issues often look different on the surface, but they usually belong to the same family of HTTPS trust and certificate-validation problems.

If the browser is warning that the site is not private, not secure, not trusted, or cannot prove its identity, this collection is the best starting point. From here, users can move into more specific certificate-authority, time-and-trust, hostname, and TLS-handshake groups.