You can't secure a plant like an office.
Downtime is the real threat
On a plant floor, a blocked packet or a rebooted controller can stop production. IT-grade security that’s safe in an office can halt a line here. That is why OT monitoring has to be passive.
Legacy gear you can’t patch
PLCs, HMIs and SCADA run for decades on firmware that can’t be updated on a Patch Tuesday. Protection has to work around them, not demand they change.
Flat, converged networks
As IT and OT converge, one phished laptop can reach the controllers that run the line. Without real segmentation, the plant floor is one hop from the business network.
Vendor access nobody watches
Integrators and OEMs dial in to service equipment, often over standing remote connections with no logging. You can’t secure what you can’t see.
Full-stack protection for industrial environments.
Passive asset discovery
Map every controller, HMI, drive and engineering station, and how they talk, without sending a single active probe onto the network.
Network segmentation
Design and validate IT/OT zones and conduits so a compromise on the business side can’t reach the production floor.
OT threat detection
GreyCortex NDR watches industrial traffic for anomalies, rogue devices and lateral movement, tuned for OT protocols, not just IT.
Vendor remote-access control
Broker, log and time-box every third-party connection into your OT, so you know exactly who touched what, and when.
OT vulnerability management
Identify exposed and end-of-life devices and prioritize by real production impact, not a generic CVSS score.
24/7 monitoring & response
Our SOC watches your OT around the clock, with response playbooks written for environments where uptime is non-negotiable.
Passive monitoring: a security control that can't stop the line.
Everything starts passively. GreyCortex NDR listens to a mirror of your network traffic. It never probes a controller, never injects a packet, never touches production. You get full visibility with zero operational risk.
Nothing we deploy sends traffic that could disturb a controller or a line.
A live map of the OT assets and connections on your network. In Honeywell’s 2026 OT Cybersecurity Benchmark of 603 industrial security respondents, one in five reported a complete asset inventory.
Read our analysis →Continuous monitoring and response built around production uptime.
