A business firewall review should not begin with a diagram of ports and protocols. It should begin with a practical question: if a criminal, faulty device or unsafe connection reached your network this afternoon, what would stop it affecting the systems your team relies on? For a small business, the answer has a direct effect on trading, customer trust and the ability to get work done.

Your firewall is the security checkpoint between your business network and the internet. It decides which connections can enter, leave or move between parts of your network. But a firewall is only as useful as its configuration, updates and ongoing oversight. A device installed years ago and left untouched may still provide some protection, yet it can also create a false sense of security.

Why a firewall review is a business priority

Most security incidents do not start with a dramatic Hollywood-style break-in. They often begin with a convincing phishing email, a stolen password, an unpatched laptop or a remote access setting that was useful during a busy period but was never revisited. The firewall cannot solve every one of these problems on its own. It can, however, reduce the routes an attacker can use and raise an early warning when something does not look right.

A proper review looks beyond whether the internet is working. It asks whether the firewall is still appropriate for the way your business operates now. Perhaps more staff work from home, you have moved systems into the cloud, introduced Wi-Fi for visitors, or added connected equipment such as cameras, phones, payment terminals or diagnostic tools. Each change can alter the level of risk.

This matters particularly for organisations that cannot afford lengthy downtime. A garage unable to access its diagnostic platform, a charity locked out of donor information, or an office unable to reach cloud files all face the same immediate problem: work stops while pressure builds. Good firewall management supports continuity as well as cyber security.

What a business firewall review should cover

A useful business firewall review combines technical checks with an understanding of daily operations. There is little value in applying a generic security template if it blocks a legitimate service or overlooks a system that is central to your work.

The firewall itself

First, establish exactly what device is protecting the network, how old it is and whether the manufacturer still supports it. Security products have a working lifespan. When support ends, the supplier stops issuing updates for newly discovered weaknesses. Continuing to use an unsupported firewall can leave a known gap at the edge of your network, regardless of how carefully it was configured in the past.

The review should also check that the correct security services are enabled and licensed. Many business firewalls can inspect suspicious traffic, block harmful websites, detect intrusion attempts and control applications. These features need current threat intelligence and sensible settings. Turning every feature on at its most aggressive level is not always the answer, as it may interrupt legitimate work. The right balance depends on your applications, users and appetite for risk.

Rules, remote access and unnecessary exposure

Firewall rules tell the device what is allowed. Over time, rules often accumulate. A supplier may once have needed access to a server. A previous IT provider may have opened a service for remote support. A temporary exception may simply have been forgotten.

Each rule should have a clear purpose, a named owner and a record of when it was last needed. Rules that allow access from anywhere on the internet deserve particular scrutiny. Where remote access is necessary, it should normally use a properly secured virtual private network, multi-factor authentication and restricted user permissions rather than exposing internal systems directly.

This is also the point to check admin access to the firewall itself. Default passwords, shared administrator accounts and management pages available from the public internet are avoidable risks. Access should be limited to authorised people, protected with multi-factor authentication where available, and recorded so changes can be traced.

Network separation

Not every device in a business needs to communicate with every other device. A visitor using guest Wi-Fi should not be able to browse the same network as finance records. A smart television, meeting-room device or internet-connected camera should not have an open path to core business systems.

Network separation, often called segmentation, creates sensible boundaries. It can place staff devices, servers, guest Wi-Fi, phones and specialist equipment into separate areas, with only the required connections permitted between them. This limits the spread of a problem if one device is compromised.

For a Sussex business with a mix of office systems and operational technology, this can be especially valuable. The aim is not to make the network difficult to use. It is to prevent a low-risk device or guest connection becoming an easy route into the systems that keep the business running.

Updates, monitoring and alerts

A firewall should receive firmware updates promptly, but responsibly. Updates often close security vulnerabilities, so delaying them indefinitely is risky. At the same time, an update should be planned around business hours and checked afterwards, particularly where you rely on specialist software, site-to-site connections or hosted phone services.

Monitoring is the difference between owning a firewall and managing one. The review should confirm that alerts are reaching someone who can investigate them, not disappearing into an unattended mailbox. Repeated blocked login attempts, unusual overseas connections, malware detections and unexpected data transfers may all warrant attention.

Logs are useful during an incident too. If a staff account is compromised, records of network activity can help establish what happened, which systems were reached and what needs to be contained. Retention periods should be long enough to support an investigation, while remaining proportionate to the size and needs of the business.

Resilience and recovery

Your internet connection may be the route to cloud applications, card payments, phones and remote support. A firewall review should therefore consider resilience as well as protection. Is there a backup connection for a site where internet loss would stop operations? Does the firewall fail over correctly, and has that process been tested rather than assumed?

Configuration backups matter too. If hardware fails or a replacement is needed after an incident, rebuilding a complex firewall from memory is slow and error-prone. A current, secure copy of the configuration can reduce recovery time significantly. It should be reviewed alongside wider backup and disaster recovery arrangements, not treated as a separate technical detail.

Warning signs that a review is overdue

Many businesses only revisit their firewall after an alert, outage or insurance questionnaire exposes a gap. It is better to review it before that point. Warning signs include an unknown or unsupported device, no clear record of who administers it, remote working introduced without a security redesign, unexplained internet slowdowns, or rules that nobody feels confident removing.

A review is also sensible after a merger, office move, major cloud migration, change of IT provider or introduction of new connected equipment. These moments change how data moves around your organisation. They are an opportunity to remove old access, document what is in place and make security fit the business you are now, not the one you were five years ago.

Turning findings into sensible action

The outcome should be a prioritised plan, not a long technical report that gathers dust. Critical issues might include replacing unsupported hardware, closing direct internet exposure or securing administrator access. Important improvements may include separating guest Wi-Fi, tightening remote access and setting up active monitoring. Lower-priority housekeeping can cover removing unused rules and improving documentation.

A good IT partner explains these findings in plain English, including the operational trade-offs. For example, blocking a category of websites may reduce risk but affect legitimate research. Requiring multi-factor authentication adds a small step for staff but makes stolen passwords far less useful. Decisions should be based on the systems you use, the information you hold and the disruption your business could tolerate.

At My Tech Team, the focus is on making security practical rather than mysterious. Whether you have an internal IT contact or need fully managed support, a firewall review should leave you knowing who is responsible, what is protected and what happens when something needs attention.

The best time to check a firewall is while everything appears to be working. That is when you can make calm, planned improvements that help ensure your technology keeps working when your business needs it most.