One red flag that consistently appears during onboarding is a firewall ruleset that has grown broad and unfocused over time. Rules are often written to allow large ranges of traffic in or out simply to make something work. As environments evolve, those rules remain in place long after their original purpose is forgotten.
The issue with blanket rules is that they prioritize convenience over intent. Allowing wide source ranges, broad destination access or unrestricted outbound traffic increases exposure without improving functionality. When an incident occurs, it becomes difficult to separate legitimate traffic from activity that should never have been permitted. This lack of precision complicates investigations and slows containment efforts.
Redundant and overlapping rules introduce additional risk. Multiple rules may allow the same traffic in slightly different ways, making it unclear which rule is actually being used. Without consistent naming conventions and clear direction indicators such as IN or OUT, sorting and auditing the ruleset becomes inefficient and error prone. Periodic reviews are necessary housekeeping to remove unused rules, eliminate duplication and ensure access still aligns with business requirements.
At STF Consulting, we recommend focused and standardized firewall rulesets because we have seen how clarity improves both security and operations. We also standardize on a defined firewall platform across the environments we manage so our team maintains deep familiarity with the interface, behavior and nuances of that hardware. This allows faster troubleshooting, cleaner rule design and more reliable audits compared to juggling multiple firewall manufacturers. Combined with regular reviews and clear rule intent, this approach results in a more predictable, supportable and secure network environment.
Not sure how your firewall is configured? Schedule a consultation and we’ll help you find out.
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