Zentera Zero Trust Gatekeeper (ZTG) is a hardware appliance that provides agentless deployment of microsegmentation and Zero Trust Network Access (ZTNA) capabilities. The product is designed for workloads that cannot deploy software agents, including manufacturing equipment, critical infrastructure, IoT devices, SCADA/PLC systems, and other operational technology assets. The ZTG deploys inline directly in front of protected workloads with minimal disruption to existing network operations. It provides security filtering at the workload level and enables onboarding to the Zentera CoIP Access Platform. The appliance enforces zero trust policies that control who can access specific resources based on role and context. The product includes threat detection and prevention capabilities and integrates with Zentera Secure Access ZTNA to enable authorized users and applications to access critical assets without installing software. Hardware bypass functionality is available on each port pair, allowing the device to fail open and maintain continuous access to critical resources even during power loss. The ZTG is available in multiple form factors: a 1U appliance with up to 32 Gigabit Ethernet ports (ZTG-IL32), a 2U appliance with up to 64 Gigabit Ethernet ports (ZTG-IL64), and an industrial model (ZTG-IL-2BPI) with 2 GE RJ45 bypass ports in a rugged DIN-rail design for operational technology environments.