Managing Obsolescence

Extend the Life of
Legacy Assets

Extend the Life of
Legacy Assets

Many industrial facilities still rely on decades-old systems – the PLCs, HMIs, controllers, and OT devices that were built for reliability, not cybersecurity. These legacy assets are too critical to retire yet too exposed to ignore.

With Trout Software, you can wrap legacy equipment in modern protective enclaves – isolating, monitoring and controlling them without disrupting production or redesigning your network.

Many industrial facilities still rely on decades-old systems – the PLCs, HMIs, controllers, and OT devices that were built for reliability, not cybersecurity. These legacy assets are too critical to retire yet too exposed to ignore.

With Trout Software, you can wrap legacy equipment in modern protective enclaves – isolating, monitoring and controlling them without disrupting production or redesigning your network.

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Balance long-lived equipments with increasingly dynamic conditions & security requirements.

Challenge

Legacy Asset Dilemma

Industrial networks are full of systems that are considered legacy:

  • They control essential operations, making replacement risky.

  • They cannot be patched to today’s security standards.

  • They leave compliance gaps auditors can’t overlook.

Manufacturers are caught in this tension: the equipment still functions, but the security and compliance ecosystem around it has shifted dramatically.

Trout Secure Twin

A Third Way: Protect, Don’t Replace

Trout gives a third option: protect what you already have. Instead of exposing legacy equipment directly, change the surrounding architecture.

How it works:

  • Create software-defined micro-DMZs in front of each legacy asset or group of assets.

  • Channel all access and traffic through the enclave – threats never reach the exposed device directly.

  • Maintain operator visibility and analytics access – the asset remains fully useful.

  • Generate audit-ready logs and enforce access controls to modern standards.

In short: you extend the life of the asset while upgrading its protection.

Trout Secure Twin
Trout Secure Twin
Trout Secure Twin
Trout Secure Twin

Who This Is For

  • Manufacturers running control systems that are no longer vendor-patchable.

  • Operations teams needing to protect production uptime while improving cyber resilience.

  • Compliance and risk leaders seeking to close gaps without asset replacement.

  • IT/OT hybrid environments where network redesign is costly or disruptive.

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Benefits at a Glance

Modernization doesn’t have to mean disruption.

Speed

Fast rollout

Protection in days, no need to stop production.

Security

Stronger security

Legacy systems isolated from modern attacks.

Efficiency

Save budget

Avoid costly redesign projects and extend the life of legacy equipment.

Compliance

Audit-ready

Activity logs and access controls mapped to CMMC, NIS2, IEC 62443.

Built for the Future

Smooth transitions

Overlay architecture adapts as your network evolves, without starting over.

FAQ

Extend the Life of Your Legacy Equipment Today

What counts as “legacy equipment”?

Legacy equipment includes industrial control systems, PLCs, HMIs, sensors, or machines that still perform essential functions but can’t be easily patched or updated. They often use outdated operating systems or network protocols and are critical to production — making replacement risky or impossible.

What counts as “legacy equipment”?

Legacy equipment includes industrial control systems, PLCs, HMIs, sensors, or machines that still perform essential functions but can’t be easily patched or updated. They often use outdated operating systems or network protocols and are critical to production — making replacement risky or impossible.

Why can’t I just isolate legacy systems with VLANs or firewalls?

Traditional VLANs and static firewalls were designed for efficiency, not security. They still allow lateral movement and broadcast exposure inside the plant. Trout’s software-defined enclaves create a stronger, modern boundary that isolates each asset or zone with encrypted communication, identity-based access, and full visibility — without changing your existing cabling or control logic.

Why can’t I just isolate legacy systems with VLANs or firewalls?

Traditional VLANs and static firewalls were designed for efficiency, not security. They still allow lateral movement and broadcast exposure inside the plant. Trout’s software-defined enclaves create a stronger, modern boundary that isolates each asset or zone with encrypted communication, identity-based access, and full visibility — without changing your existing cabling or control logic.

How does Trout protect old equipment without touching it?

Trout uses a proxy-based architecture that sits between the asset and the rest of the network. All connections pass through a Trout Access Gate, which enforces Zero-Trust policies, filters protocols, and records activity. The legacy device stays exactly as it is — but it’s now surrounded by modern security controls.

How does Trout protect old equipment without touching it?

Trout uses a proxy-based architecture that sits between the asset and the rest of the network. All connections pass through a Trout Access Gate, which enforces Zero-Trust policies, filters protocols, and records activity. The legacy device stays exactly as it is — but it’s now surrounded by modern security controls.

Can this help with CMMC, NIS2, or IEC 62443 compliance?

Yes. Trout enclaves provide many of the required technical safeguards for regulated environments — including network segmentation, access control, and monitoring. The solution helps organizations demonstrate compliance with frameworks such as CMMC Level 2, NIS2, IEC 62443, and NIST 800-82, especially when older systems can’t meet those standards natively.

Can this help with CMMC, NIS2, or IEC 62443 compliance?

Yes. Trout enclaves provide many of the required technical safeguards for regulated environments — including network segmentation, access control, and monitoring. The solution helps organizations demonstrate compliance with frameworks such as CMMC Level 2, NIS2, IEC 62443, and NIST 800-82, especially when older systems can’t meet those standards natively.

Will this disrupt production or require downtime?

No. Installation happens at the network edge and can typically be completed without stopping production. The device sits transparently between your legacy asset and the network, so operations continue while Trout adds protection and visibility in parallel.

Will this disrupt production or require downtime?

No. Installation happens at the network edge and can typically be completed without stopping production. The device sits transparently between your legacy asset and the network, so operations continue while Trout adds protection and visibility in parallel.

How fast can we deploy it?

A single Trout Access Gate can be operational in days, and multi-site rollouts are typically completed in weeks. Because it doesn’t require re-engineering or recabling, scaling across multiple lines or plants is straightforward.

How fast can we deploy it?

A single Trout Access Gate can be operational in days, and multi-site rollouts are typically completed in weeks. Because it doesn’t require re-engineering or recabling, scaling across multiple lines or plants is straightforward.

Does Trout send data to the cloud?

No. All processing and enforcement happen on-premises. Sensitive production or CUI/FCI data never leaves your site, which is particularly important for defense contractors and critical infrastructure operators.

Does Trout send data to the cloud?

No. All processing and enforcement happen on-premises. Sensitive production or CUI/FCI data never leaves your site, which is particularly important for defense contractors and critical infrastructure operators.

Related Resources

Manufacturing Overlay

Why Patching Isn’t Always an Option in OT

Challenges, strategies, and best practices for securing industrial systems without disrupting operations.

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How to Add Visibility to Dark OT Networks

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Trout Secure Twin
Trout Secure Twin

Beyond Purdue

A practical roadmap for securing modern industrial networks — without costly rebuilds.

Extend Life of Legacy Equipment with Trout Access Gate

CMMC for OT and Legacy

In Summary: Keep Your Proven Equipment, and Make It Secure

Most industrial networks weren’t built for the cybersecurity landscape of today. They run on proven machines — PLCs, HMIs, and control systems — that have delivered reliability for decades but were never designed with security or compliance in mind. Replacing them isn’t always realistic; production uptime, cost, and vendor dependencies make it nearly impossible.

Trout provides a practical alternative. Instead of forcing outdated equipment into modern security frameworks, Trout surrounds each legacy asset with a software-defined protective enclave. Every connection to the device passes through a hardened proxy that enforces Zero-Trust policies, encrypts traffic, and captures detailed audit logs. The result: you gain visibility, segmentation, and compliance — without modifying or interrupting production systems.

This approach extends the useful life of your legacy equipment while aligning with modern frameworks such as CMMC, NIS2, IEC 62443, and NIST 800-82. It’s a fast, on-premises solution with no cloud dependency — ideal for manufacturers, defense contractors, and operators of critical infrastructure.

With Trout, you can secure what you already own, protect operational continuity, and transform legacy risk into a manageable, auditable part of your cybersecurity posture.
Modernize your network — not your machines.

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