Protect Legacy Equipment Without Touching It.
CNC machines, PLCs, and HMIs that can't be upgraded or patched — still exposed at the network level. Agentless Zero Trust enforcement. No production disruption. No firmware changes.
Secure Legacy Machines. No Agent Required.
Five capabilities that protect legacy CNC, PLC, and HMI equipment at the network level — without touching operational systems or disrupting production.
Agentless Legacy Protection
No agents, no firmware updates, no software to install on production equipment. Network-level enforcement protects every device — regardless of age, OS, or patchability.
Full Shop Floor Visibility
Automatic discovery of every device on your factory network — from decades-old CNC machines to modern PLCs. Know exactly what's connected and what it's doing.
Flat Network Segmentation
Replace dangerous flat factory networks with controlled segmentation. Overlay micro-DMZs isolate legacy equipment without VLAN restructuring or re-cabling.
CUI Flow Control
Enforce strict access policies on data flows touching CUI — engineering designs, production plans, and tooling data. Every flow authenticated and logged.
CMMC & NIS2 Documentation
Automatic control documentation for CMMC Level 2 and NIS2. Assessment-ready evidence of network segmentation, access control, and audit logging — on demand.
Plug-and-Protect Deployment
Deploys as appliance or VM inline on your existing factory network. No architecture changes. Up and running in hours without stopping production.
No Agents on Legacy Equipment
Protect CNC machines and PLCs without installing software on operational equipment. Network-level only.
Isolate CUI from General IT
Micro-segment engineering data flows and CUI from administrative networks without replacing infrastructure.
Trusted by manufacturers across the supply chain.
on-site CUI data flows, from engineering designs to production plans, aligned with CMMC Level 2 compliance.
Trusted by leading companies
“The Trout Access Gate gave us a clear path to CMMC compliance without disrupting our manufacturing operations.”
Ready to get started?
Talk to our team to see how the Trout Access Gate fits your environment.
Securing Modbus in Modern Industrial Environments.
Architecture, risks, and practical security controls for a protocol that was never designed to be connected — but now is.
What you'll learn
Why Modbus has no native security and why that matters now. How a 5-step attack path leads from IT breach to physical process manipulation — using only legitimate protocol commands. How the Enforcement Layer introduces mediated trust without modifying PLCs or network topology.
Apply It With Access Gate
Access Gate implements the Enforcement Layer as a single inline appliance. Function code allowlisting, register-level access control, identity-bound sessions, and full audit logging — no changes to PLCs, no network redesign, no downtime.
Common Questions About Legacy OT Protection.
average time from unboxing to full protection across a legacy factory network.
Yes. The Access Gate operates at the network level — no software is installed on endpoints. It protects CNC machines, PLCs, HMIs, and any device connected to the network, regardless of age, operating system, or patchability.
No. The Access Gate installs inline on existing network infrastructure. No re-cabling, no IP changes, no VLAN restructuring. Production continues uninterrupted during deployment.
The Access Gate creates encrypted overlay micro-DMZs between zones — isolating legacy CNC and PLC networks from engineering, ERP, and corporate IT. Policy is enforced at the network level without touching device configurations.
Yes. The Access Gate enforces strict access policies on all data flows involving CUI — engineering designs, production plans, and tooling data. Every flow is authenticated, scoped to authorized users, and fully logged.
No. The Access Gate is designed for organizations without a dedicated security team. It provides sensible defaults, automated policy templates, and a straightforward management interface that IT generalists can operate.
