Security & Compliance · Engineering, IT & AI
Should you build or buy Secure Remote Access for OT (Privileged OT/ICS Access)?
Secure Remote Access for OT software provides session brokering, just-in-time access approvals, and privileged access controls for operational technology environments — PLCs, HMIs, and ICS systems — where contractor and vendor remote access is a documented attack vector. It's used by industrial operators in manufacturing, energy, and utilities to control who can reach critical equipment and record what they do when they get there.
The build-vs-buy decision for Secure Remote Access for OT turns on whether any internal team can credibly replicate OT protocol libraries and air-gap-compatible session brokering without years of dedicated development; the specifics of your equipment estate and contractor access volume decide which vendor's protocol support actually fits.
Build it, buy it, or bridge?
When building makes sense
There is no credible self-build path for OT privileged access management at production scale. Agentless session brokering with PLC and HMI protocol support, designed for air-gapped environments with hard safety constraints, requires years of OT-specific development that vendors have already invested. Colonial Pipeline is the frequently cited real-world example of what happens when contractor remote access to industrial systems is inadequately controlled. No independent engineering team has shipped a production alternative covering PLC/HMI protocol passthrough, moving-target-defense architectures, and air-gap-compatible design in combination. The only scenario where internal development touches this space is within large industrial organizations with existing OT expertise building narrowly scoped JIT approval workflows on top of existing vendor platforms — which is the bridge pattern, not a build from scratch.
When buying makes sense
Buying is the right call for any industrial operator where third-party contractors access PLCs, HMIs, or ICS equipment remotely. The session brokering, JIT approval workflows, and session recording that platforms like Claroty Secure Remote Access and Cyolo PRO provide aren't replicable internally at the OT protocol level. Beyond the technical argument, the compliance and insurance angle is meaningful — industrial cyber insurance increasingly requires documented privileged access controls for OT environments. The real buying decision is vendor selection: which platform's connector library covers the specific PLC and HMI equipment in your estate, and which JIT approval workflow model fits your contractor management processes. Dispel's focus on smaller industrial operations and Waterfall Security's hardware-enforced unidirectional architecture serve different parts of the market than Claroty's enterprise coverage.
The desk read
Third-party and contractor access to PLCs and HMIs is a documented attack vector in critical infrastructure. The session brokering and JIT approval workflows in platforms like Claroty Secure Remote Access, Cyolo PRO, and Xage Security encode each site's specific vendor access patterns, safety interlocks, and protocol requirements. That configuration is deeply site-specific and shapes how remote access works in practice.
Buying earns its keep for any industrial operator where a contractor breach via remote access is a realistic threat model. It's also worth noting that Colonial Pipeline is the documented cautionary tale here. The build case is not viable. Agentless OT-aware session brokering with PLC and HMI protocol support, designed for air-gapped environments with safety constraints, is not something engineering teams build internally. The conversation is which vendor's OT protocol library covers the specific equipment estate, not whether to buy.
Frequently asked
What is Secure Remote Access for OT (Privileged OT/ICS Access)?
Secure Remote Access for OT provides session brokering, just-in-time access approvals, and privileged access controls for operational technology environments — PLCs, HMIs, and ICS systems — where contractor and vendor remote access is a documented attack vector. It gives industrial operators control over who reaches critical equipment and a full audit record of every session.
When does building Secure Remote Access for OT (Privileged OT/ICS Access) make sense?
Building from scratch is not viable. The OT protocol expertise, air-gap design requirements, and safety constraint architecture these platforms embody aren't replicable by an internal team without years of dedicated development. The closest to a build case is configuring site-specific JIT workflows on top of an existing vendor platform.
When does buying Secure Remote Access for OT (Privileged OT/ICS Access) make sense?
Buying makes sense for any industrial operator with third-party contractor access to PLCs or HMIs — which is nearly all of them. The protocol library and air-gap architecture vendors bring can't be replicated internally, and the risk of a contractor breach via poorly controlled remote access is both real and well-documented.
What are the main Secure Remote Access for OT (Privileged OT/ICS Access) vendors?
Representative vendors include Claroty Secure Remote Access (SRA), Cyolo PRO, Waterfall Security (HERA), Dispel. B4 Pro scores the full set.