Services

OT Firewall & Network Hardening

Strengthening the Perimeter and Internal Defenses to Safeguard Critical Industrial Networks From Evolving Threats

The Challenge

Industrial networks are often sprawling ecosystems of interconnected devices, legacy systems, and operational technologies that require tailored security controls. Unlike traditional IT environments, OT networks have unique traffic patterns, strict uptime requirements, and devices that may not support modern security protocols. This complexity makes firewall and network hardening especially challenging.

Key challenges include:

      • Managing segmented network zones without disrupting real-time OT communication

      • Implementing strict access controls while maintaining operational flexibility

      • Dealing with legacy systems that lack native security features or patch support

      • Preventing unauthorized lateral movement and minimizing attack surfaces

      • Ensuring firewall rules keep pace with frequent network changes and new device deployments

      • Balancing security policies with compliance requirements and operational constraints

Without precise tuning and expertise, hardening efforts can inadvertently impact production or leave gaps that attackers can exploit.

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The Solution

Defy Security approaches OT firewall and network hardening with a focus on operational continuity and layered defense. Our experts work closely with your engineering and security teams to design and implement robust firewall policies and network segmentation strategies tailored for OT environments.

Our hardening services include:

      • Comprehensive network mapping to identify critical assets and traffic flows

      • Customized firewall rule creation to enforce least privilege and micro-segmentation principles

      • Deployment of stateful and application-aware firewalls optimized for OT protocols

      • Ongoing rule review and tuning to adapt to evolving network architectures

      • Hardening of network devices including switches, routers, and gateways

      • Collaboration with OT operators to ensure zero impact on critical processes

By integrating deep OT knowledge with security best practices, Defy Security ensures your network defenses are both strong and operationally safe.

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A hardened network is the backbone of resilient operational technology security.

Your Proactive Security Partner

Customers work with Defy Security to simplify their buying experience. We provide initial assessment and analysis of technologies and custom proof of concepts. Our business analysis of licensing and financing structure saves you money. We oversee implementation and operation with staffing and services to ensure success.

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