> For the complete documentation index, see [llms.txt](https://help.security.gallagher.com/knowledge-hub/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://help.security.gallagher.com/knowledge-hub/products/cc-hardware/controllers/controller-6000/reference/controller-6000-certificates-and-keys.md). # Certificates and keys Understand Controller 6000 certificates, keys, trust, and certificate revalidation. Certificate and key behaviour is identical between the C6000 and the C7000. For the full reference, see [Controller 7000 - Certificates and Keys](/knowledge-hub/products/cc-hardware/controllers/controller-7000-and-7000-sdc/reference/controller-7000-certificates-and-keys.md). For the **Revalidate Certificate** override, the most common operational interaction with certificates on the C6000, see [Revalidate Certificate](/knowledge-hub/products/cc-hardware/controllers/controller-6000/configure/controller-6000-revalidate-certificate.md). *** 🔗 **Related** * [Controller 7000 - Certificates and Keys](/knowledge-hub/products/cc-hardware/controllers/controller-7000-and-7000-sdc/reference/controller-7000-certificates-and-keys.md). The full certificate and key reference. * [Revalidate Certificate](/knowledge-hub/products/cc-hardware/controllers/controller-6000/configure/controller-6000-revalidate-certificate.md). Bringing a controller back online after a certificate mismatch. --- # Agent Instructions This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com. ## Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation by asking a question. Perform an HTTP GET request on the following URL with the `ask` and `goal` query parameters: ``` GET https://help.security.gallagher.com/knowledge-hub/products/cc-hardware/controllers/controller-6000/reference/controller-6000-certificates-and-keys.md?ask=&goal= ``` `ask` is the immediate question: it should be specific, self-contained, and written in natural language. `goal` is what the user is ultimately trying to achieve, the reason they need the answer. Sharing it helps GitBook give you a better, more relevant answer. A goal is most helpful when it describes the outcome the user wants rather than restating the question. For example, with `ask=how do I create an API token`, a goal like `automate deployments from our CI pipeline` lets GitBook tailor the answer to that use case. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.