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verify your environment meets these requirements supported hardware {{k3}} , application version 6 3 1 x or later, with initial setup completed (including loading a platform master key and network configuration) supported operating systems red hat enterprise linux (rhel) required access an account on the kmes with administrator permissions to create roles, identities, tls pki, and update system settings local administrator/root access on the rhel server where you install red hat certificate system (rhcs) network and firewall allow outbound tcp port 2001 (default host api port) from the rhel server to the kmes series 3, specified by fqdn (for example, kmes example com ) or cidr (for example, 10 0 0 0/24 ) tls inspection or ssl proxies can break mutual tls handshakes exempt the kmes fqdn(s) from inspection configure the kmes series 3 with an fqdn so the exemption applies other openssl red hat certificate system subscription (purchased through red hat)