What is a Firewall Configuration Review?
A Firewall Configuration Review is an in-depth assessment of your organisation’s firewall rules, policies, and architecture. The review examines how network traffic is filtered and controlled, ensuring that configurations follow best practice and align with your security and compliance requirements.
For executives, this service provides assurance that your network perimeter — and the systems it protects — are resilient against modern attack techniques. A misconfigured firewall can expose critical assets, enable lateral movement, or allow sensitive data to leave the network undetected. Regular reviews are therefore essential for operational resilience and regulatory compliance under frameworks such as ISO 27001, NIST CSF, and DORA.
Why Your Business Needs a Firewall Configuration Review
Firewalls often evolve alongside growing infrastructure, third-party integrations, and cloud deployments. Over time, unused or overly permissive rules can accumulate, introducing unnecessary exposure and compliance risk.
A Firewall Configuration Review validates that your ruleset supports your business objectives securely and efficiently. It identifies misconfigurations, ensures proper segmentation, and confirms that only authorised traffic is permitted. For regulated sectors, it also demonstrates active risk management and due diligence to auditors and investors.
Benefits of a Firewall Configuration Review
- Identify misconfigurations, redundant rules, and security gaps
- Validate compliance with ISO 27001, NIST, CIS Controls, and DORA
- Strengthen perimeter and internal network segmentation
- Reduce the likelihood of unauthorised access or data exfiltration
- Optimise performance and simplify rule management
- Demonstrate proactive governance to regulators and stakeholders
How Rexon Cyber Delivers
Rexon Cyber’s consultants conduct detailed rulebase analysis across leading firewall platforms including Palo Alto Networks, Fortinet, Cisco, Check Point, and AWS/Azure security groups.
We assess access control lists (ACLs), NAT configurations, logging practices, and policy alignment with your internal standards. Our methodology is based on CIS Benchmarks and NIST SP 800-41 Rev 1 guidelines for firewalls and network security.
Each engagement concludes with a detailed report outlining:
- High-risk and redundant rules
- Recommended optimisations
- Compliance observations
- A business-friendly executive summary suitable for board review
FAQ's
Recommended Next Steps
Combine your Firewall Configuration Review with an External Penetration Test and Vulnerability Assessment to gain complete assurance over your network perimeter and internal resilience.