> ## Documentation Index
> Fetch the complete documentation index at: https://docs.futurex.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Before you start

> Checklist of environment prerequisites before integrating with Red Hat Certificate System.

Verify your environment meets these requirements.

## Supported hardware

* CryptoHub, `7.0.3.x` or later.

## Supported operating systems

* Red Hat Enterprise Linux (RHEL) 8.x

## Required access

* An account on the CryptoHub with administrator permissions to deploy new services.
* Local administrator/root access on the RHEL server where Red Hat Certificate System (RHCS) is installed.

## Network and firewall

* Allow outbound TCP port **2001**(default Host API port) from the RHCS instance to the CryptoHub, specified by FQDN (for example, `cryptohub.example.com`) or CIDR (for example, `10.0.0.0/24`).

<Warning>
  TLS inspection or SSL proxies can break mutual TLS handshakes. Exempt the CryptoHub FQDN(s) from inspection. Configure the CryptoHub with a FQDN so the exemption applies.
</Warning>

## Other

* Red Hat Certificate System subscription (purchased through Red Hat)