How often should I test my OT network security?

Enhance your OT network security with regular testing: conduct periodic risk assessments, quarterly vulnerability scans, annual penetration testing, and ongoing configuration reviews. Don't wait for an attack to reveal weaknesses—strengthen defences with continuous monitoring and improvements.

OT network security should be tested regularly, but testing must be planned carefully. Unlike corporate IT systems, OT systems may be sensitive to intrusive scanning, unexpected traffic and uncontrolled changes. The right frequency depends on risk, regulatory requirements, system criticality and change activity.

At a minimum, OT security posture should be reviewed after major changes, new remote access arrangements, system upgrades, incidents, supplier changes and significant architecture changes. Many organisations also carry out annual or periodic assessments as part of governance or compliance programmes.

Types of testing

Testing can include document review, architecture review, firewall rule review, asset inventory validation, configuration checks, vulnerability assessment, remote access review, backup restore testing, tabletop incident response exercises and carefully controlled technical testing.

Penetration testing in OT requires specialist planning. It should be scoped, risk assessed and agreed with operations before any activity begins.

Testing without disruption

Safe testing starts with clear boundaries. Define what systems are in scope, what methods are allowed, what times are acceptable, who can stop the test, and how findings will be handled. Passive discovery and offline review may be appropriate before active testing.

How ControlShield can help

ControlShield can help design an OT security testing programme that balances assurance with operational safety. We support audits, risk assessments, vulnerability assessment planning, Cyber FAT/SAT requirements, incident response exercises and non-disruptive reviews.

We help you test the right things in the right way, with engineering and operations fully involved.

Contact ControlShield to plan safe, proportionate OT security testing for your environment.