Micro-Segmentation Gatekeeper (MSG) by Zentera Systems enables agentless deployment of micro-segmentation and Zero Trust Network Access (ZTNA). Designed for instant Zero Trust onboarding for workloads without a zLink agent, like manufacturing equipment, critical infrastructure, and IoT devices, MSG offers security filtering at the workload, enabling onboarding to the Zentera CoIP Access Platform. MSG's simple deployment model allows security to be inserted directly in front of workloads with minimal disruption. Once in place, MSG provides immediate threat detection and prevention benefits. Administrators can configure access policies without altering the network. By integrating Zentera Secure Access ZTNA, enterprises can grant authorized users and applications privileged access directly to critical assets and resources based on role and context, without installing any software. Available with optional independent hardware bypass on each port pair, MSG can be configured to fail open, ensuring continuous access to critical assets and resources, even if MSG loses power. MSG-IL32 1U appliance offers up to 32 Gigabit Ethernet ports, featuring micro-segmentation, threat detection/prevention, and Zero Trust Network Access (ZTNA) for remote users and applications. MSG-IL64 2U appliance provides up to 64 Gigabit Ethernet ports with similar features. Agent-based and agentless models are supported by Zentera zLink CoIP Endpoint Proxy. CoIP Gateway Proxy provides ZTNA service termination for remote user and application access.