# Introduction
import {Head} from "zudoku/components";
Introduction - Cert Chief
Cert Chief helps you monitor domains and TLS-enabled services so certificate and HTTPS problems are caught before your users notice them.
With Cert Chief you can keep an eye on things like:
- certificate expiration, revocation, and unexpected certificate changes;
- broken TLS configuration or hostname mismatches;
- DNS resolution, DNSSEC, and DANE issues;
- HTTP or HTTPS behavior such as unexpected status codes and redirects to HTTPS.
Cert Chief performs recurring checks for the domains and services you ask it to monitor and notifies you when something changes or needs attention.
You can also run a more extensive TLS/SSL Server Test powered by testssl.sh from cert.chief.app/testssl. For monitored domains, Cert Chief may also periodically refresh these test results for you.
If you need a provider-facing explanation of the monitoring traffic Cert Chief generates, including user agents and IP addresses, see [Bot information](/certchief/bot).
This documentation site is fresh and we know many things are still missing or incomplete, please contact us if you are looking for a specific answer that is not yet answered here!