The most common — and most dangerous — mistake in OT security is importing IT practices wholesale. An aggressive vulnerability scan that's routine against a web server can crash a PLC or knock a control loop offline. Uptime and safety come first in OT, ahead of confidentiality, which inverts the priority order most security people are trained on.
What we do differently
- Passive monitoring and asset discovery before any active testing is even discussed
- Every recommendation is weighed against safety and uptime impact first
- Segmentation between IT and OT — and between safety-critical zones — gets reviewed before anything else
- Standards like IEC 62443 guide the assessment, not a generic IT security checklist
If your last "security assessment" of an OT environment looked identical to your IT pentest report, it probably missed the parts that actually matter.