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kms/docs/documentation/platform/pki/ca/lets-encrypt.mdx
zeekay 0ebffbd529 fix: white-label KMS branding and fix broken identifiers
- Fix 381 files where branding script corrupted variable names
  (e.g. isHanzo KMSTemplate -> isKmsTemplate)
- Rebrand from "Hanzo KMS" to just "KMS" for white-label support
  (allows Lux KMS, Hanzo KMS, etc. via configuration)
- 856 files, purely string replacements, no logic changes
2026-02-13 10:25:11 -08:00

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---
title: "Let's Encrypt"
description: "Learn how to connect KMS to Let's Encrypt to issue certificates."
---
## Concept
KMS can connect to [Let's Encrypt](https://letsencrypt.org/) using the [ACME-compatible CA integration](/documentation/platform/pki/ca/acme-ca) to issue certificates back to your end-entities.
## Guide to Connecting KMS to Let's Encrypt CA
To connect KMS to Let's Encrypt, follow the steps in the [ACME-compatible CA integration](/documentation/platform/pki/ca/acme-ca) guide but use the Let's Encrypt **ACME Directory URL**: `https://acme-v02.api.letsencrypt.org/directory`.
Note that Let’s Encrypt issues 90-day certificates and enforces a limit of 50 certificates per registered domain per week.
We strongly recommend testing your setup against the Let's Encrypt staging environment first at the **ACME Directory URL** `https://acme-staging-v02.api.letsencrypt.org/directory` prior to switching to the production environment. This allows you to verify your DNS configuration and certificate issuance process without consuming production rate limits.