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verify your environment meets these requirements supported hardware {{k3}} , application version 6 3 1 3 or later, with initial setup completed (including loading a platform master key and network configuration) supported operating systems windows 10 or later 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 windows machine where signtool is installed network and firewall allow outbound tcp port 2001 (default host api port) from the windows client machine 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 microsoft signtool signtool is available as part of the windows sdk, which you can download from https //developer microsoft com/windows/downloads/windows 10 sdk/ https //developer microsoft com/windows/downloads/windows 10 sdk/