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TLS Errors

Diagnosing certificate-expired, hostname-mismatch, and incomplete-chain TLS errors. Each entry explains the cause, which clients are affected, and how to fix it.

TLS Error: Certificate Expired

Causes, symptoms, and step-by-step resolution for expired TLS certificates using the TLS Inspector.

TLS Error: Hostname Mismatch

The certificate does not cover the domain you are connecting to. How to diagnose and fix a hostname mismatch error.

TLS Error: Incomplete Certificate Chain

Why some clients fail while others work, and how to serve the full chain to fix incomplete chain errors.