Managed OT Security
An OT vulnerability and configuration review every quarter, a yearly update of the risk analysis, an incident response plan exercise and an expert for incidents. The scope is built from OT security services that nFlo also delivers as separate projects.
Describe your scope — your account manager will reply within 24 hours.
- From €1,900/month net
- Delivery: 12-month contract
- Free quote
What is managed OT security?
It is a contract under which nFlo delivers its OT security services on a fixed schedule instead of as separate projects: a passive OT vulnerability and configuration review every quarter; once a year an update of the risk analysis, a review of IT/OT segmentation and of OT policies and procedures, and an incident response plan exercise; and an OT expert for incidents throughout the contract. The subscription does not include continuous monitoring of the OT network.
Contact your account manager
Discuss Managed OT Security with your dedicated account manager.
A one-off OT audit describes the plant as it was on the day of the audit
nFlo OT services on a fixed rhythm, in one contract
Reviews every quarter
Vulnerabilities and configuration of OT devices checked with passive methods
Risk and architecture once a year
Update of the risk analysis, IT/OT segmentation and policies and procedures
Incident readiness
A yearly incident response plan exercise and an OT expert for incidents
What is managed OT security?
Managed OT security is a single 12-month contract in which nFlo’s OT security services follow a fixed calendar. Instead of ordering a vulnerability assessment, a risk analysis or an incident response plan exercise separately, you get them on an agreed rhythm for one site: reviews every quarter, updates once a year and an OT expert you call when an incident happens. The subscription covers OT networks and devices, meaning the operational technology that controls production, such as PLCs and SCADA systems.
| Attribute | Description |
|---|---|
| Subject | 1 site: OT networks and devices (PLC, SCADA, HMI) |
| Rhythm | reviews every quarter, risk analysis and incident response exercise once a year |
| Scope | nFlo OT security services delivered on a fixed calendar |
| Result | a report for management every quarter |
Why a one-off OT audit is not enough
An OT security audit shows the state of the plant on the day of the audit. A few months later that picture is already incomplete. New devices and network changes appear at the plant, machine vendors get remote access to their installations, and new vulnerabilities are disclosed in the firmware of controllers and ICS systems. Without regular progress checks, the remediation plan from the audit is easily put off.
The same applies to the incident response plan. A plan that nobody has exercised quickly stops matching the plant: people, phone numbers and systems change, and the IT and OT teams do not know who decides to disconnect the network. We describe the differences between IT and OT security in the article OT vs IT security, and the approach to zones, conduits and processes under the IEC 62443 standard in the practical guide to IEC 62443. All nFlo OT security services are listed on the OT security page.
The subscription answers this problem with rhythm: the same services that nFlo delivers as separate projects come back on a fixed calendar, and the results of each review are compared with the previous one.
What the subscription includes
| Module | Rhythm | Based on |
|---|---|---|
| OT vulnerability and configuration review | every quarter | OT Vulnerability Assessment and Configuration Analysis |
| OT risk analysis | once a year | OT Risk Assessment and Analysis |
| IT/OT segmentation and remote access | once a year | OT Security Architecture Analysis |
| OT policies and procedures | once a year | OT Security Policies, Standards and Procedures |
| Incident response plan exercise | once a year | OT Incident Response Planning and Testing |
| An OT expert for incidents | throughout the contract | OT Incident Response Expert Support |
| Report for management | every quarter | vulnerability status, remediation plan progress and changes in risk |
- OT vulnerability and configuration review: we work with passive methods, without active scans that could disrupt production. We update the inventory of OT devices (PLC, SCADA, HMI, DCS), check known vulnerabilities in firmware and review device configuration for hardening. For systems that cannot be updated without downtime, the remediation plan points to compensating controls.
- OT risk analysis: once a year we update the OT-specific threats and their impact on production continuity, physical safety and the environment. The result is a list of the most important risks for management and an action plan.
- IT/OT segmentation and remote access: we review zones and conduits according to IEC 62443 and the Purdue model, the DMZ between IT and OT, and the rules for remote access by vendors and service teams.
- OT policies and procedures: we review and update the documentation of the cybersecurity management system (CSMS) according to IEC 62443-2-1 — access control, change management, patch management and incident response.
- Incident response plan exercise: once a year we run a tabletop exercise with the IT and OT teams, based on scenarios such as ransomware, sabotage of a PLC or an attacker moving from the IT network to OT. After the exercise we update the plan and the escalation matrix.
- Report for management: every quarter we describe the vulnerability status, remediation plan progress and changes in risk. Once a year the report includes an up-to-date compliance matrix for IEC 62443 and NIS2.
An OT expert for incidents
Throughout the contract you have access to OT experts on the terms of the OT incident expert support service: the alarm line is available 24/7, and remote support is provided within the time agreed in the contract. The number of support hours per year and the terms of on-site work at the plant are set in the contract. This is readiness to respond to an incident, not supervision of the OT network.
What the subscription does not include
The subscription does not include continuous monitoring of the OT network or threat detection by a SOC.
The following are also outside the subscription and available as separate services:
- OT/ICS penetration testing,
- OT/ICS ransomware resilience testing,
- OT security architecture design and implementation of network changes,
- a full NIS2 compliance assessment for OT/ICS,
- sites beyond the scope of the contract — individual quote.
If the site has never had an OT security audit, we start with a baseline assessment — an OT/ICS security audit or a vulnerability and configuration assessment. Its scope and price are set separately in the offer.
Subscription price and scope
| Attribute | Value |
|---|---|
| Price | from €1,900/month net |
| Term | 12-month contract |
| Scope included | 1 site |
| Rhythm | reviews every quarter, risk analysis and incident response exercise once a year |
| Several sites | individual quote |
Contact us to agree the scope and the review calendar for the first year.
Who is this for?
This service is for you if:
- you run a plant with SCADA systems and PLCs but do not have your own OT security specialist on the team,
- you have had an OT audit and want the remediation plan to be carried out rather than put off,
- you are subject to NIS2 and need an up-to-date risk analysis and an exercised incident response plan,
- machine vendors and service teams connect remotely to your OT network and you want to check the rules for that access regularly.
Related Glossary Terms
Learn more about the key concepts related to this service:
How we work
Our proven service delivery process.
Scope and baseline
We agree the site, networks and devices in scope and collect the results of previous OT audits and analyses
A 12-month calendar
We schedule quarterly reviews, the yearly risk analysis and the incident response plan exercise for the whole contract period
Reviews and exercises
We carry out the reviews and update the risk analysis, segmentation, policies and response plan according to the calendar
Report for management
Every quarter we report on the vulnerability status, remediation plan progress and changes in risk
Benefits for your business
What you gain by choosing this service.
An up-to-date picture of risk
The risk analysis and the list of vulnerabilities keep pace with changes at the plant
Incident readiness
A response plan exercised with the IT and OT teams and an OT expert you call when an incident happens
Predictable cost
A fixed monthly fee instead of a separate order for each service
Documents for auditors and management
Quarterly reports and an up-to-date compliance matrix for IEC 62443 and NIS2
Related Articles
Expand your knowledge with our resources.
OT/ICS Security in the Energy Sector — Why the Approach Known from IT Fails Here
Control networks in the energy sector follow a different logic than office systems — here continuity of the process matters, not data confidentiality. We show why tools and reflexes carried over from IT fail in OT environments and how to build protection aligned with IEC 62443 and NSC/NIS2 requirements.
Read more →How to Conduct OT Security Audit in Energy Company
Complete guide to OT/ICS security audits in the energy sector. Methodology, scope, tools, and reporting aligned with IEC 62443 and NIS2 requirements.
Read more →How to Implement IT/OT Network Segmentation in Energy
Practical guide to IT/OT network segmentation in the energy sector. Purdue model, IEC 62443 zones, industrial DMZ, and phased deployment without downtime.
Read more →Frequently Asked Questions
Common questions about Managed OT Security.
How much does managed OT security cost?
The subscription costs from €1,900 net per month with a 12-month contract and covers 1 site. Several sites or a wider scope are quoted after agreeing how many OT networks and devices the contract covers.
What does the subscription include?
A quarterly OT vulnerability and configuration review; once a year an update of the risk analysis, a review of IT/OT segmentation and remote access, a review of OT policies and procedures and an incident response plan exercise; and throughout the contract an OT expert for incidents and a quarterly report for management.
Does the subscription include monitoring of the OT network?
No. The subscription does not include continuous monitoring of the OT network or threat detection by a SOC. It is a rhythm of reviews and exercises plus an OT expert for incidents.
What if the site has never had an OT security audit?
Then we start with a baseline assessment — an OT/ICS security audit or a vulnerability and configuration assessment. Its scope and price are set in the offer, and later reviews in the subscription are compared against this baseline.
How does the subscription differ from one-off OT services?
The scope is the same — these are services nFlo also delivers as separate projects. The difference is the rhythm: reviews and exercises follow a fixed 12-month calendar, and an OT expert is available for incidents throughout the contract.
Does the subscription help meet NIS2 requirements?
The NIS2 directive (Article 21) requires, among other things, risk analysis, incident handling and business continuity. The subscription keeps the risk analysis up to date, the incident response plan exercised and, once a year, the compliance matrix for IEC 62443 and NIS2 current. A full NIS2 compliance assessment for OT environments is a separate service.