Protect machines you can't patch. Nothing to install on them.
Legacy CNC and PLC security
CNC machines, PLCs and HMIs stay as they are. Access Gate protects them from the network, with no firmware changes and no downtime.
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Old machines, protected from the network.
Access Gate connects to your existing factory network. Production keeps running.
See every machine.
Find every machine on the shop floor, from decades-old CNC machines to new PLCs.
Control who reaches what.
Keep old machines and CUI flows away from office IT. No VLAN changes, no re-cabling.
Reach any machine, securely.
Engineers and vendors log in with MFA. Each session reaches only the machines it needs.
Prove every audit.
Every connection is logged. Export the evidence your assessor asks for.
Up in a day per plant.
Access Gate connects to your existing factory network. No architecture change, no production stop.
Nothing to install on machines.
CNC machines and PLCs stay as they are. Access Gate works from the network.
Keep CUI away from office IT.
Engineering data and CUI flows stay apart from office networks. No new infrastructure.
The gate is the first service you run, not the last.
Secure your plants today. Control your digitalization tomorrow.
Access Gate puts compute on the wire, next to your assets. Once the gate is in, the same box hosts the services that pull OT in securely: remote access, protocol gateways, DNS and time, historian, update server. Accelerate your digitalization, in control.
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.”
Director of IT
Defense Contractor · Elna Magnetics
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 applies these controls from one appliance beside the network: function code allowlisting, register-level access control, identity-bound sessions and full audit logs. No PLC changes, no network redesign, no downtime.
Common questions about legacy OT protection.
from unboxing to full protection across a legacy factory network.
Yes. Access Gate is agentless: it works at the network level, and nothing is installed on endpoints. It protects CNC machines, PLCs, HMIs and any networked device, whatever its age, operating system or patch level.
No. Access Gate connects to your existing network rather than cutting into it. No re-cabling, no IP changes, no VLAN restructuring. Production keeps running 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.
