7 Common Firewall Mistakes and How to Avoid Them

Most businesses have a firewall. The problem is that many of them aren’t using it properly. Firewalls don’t just work by being plugged in. They rely on good setup, maintenance, and monitoring to continue performing their job effectively.

And that’s where many SMBs slip up. Here are some common firewall mistakes and how to avoid them.

Using the default settings

When a new firewall is installed, it often comes with “default” or factory settings. These are designed to get things running quickly. But they’re not tailored to your business. Default settings can leave unnecessary ports open or fail to block certain risky types of traffic.

A properly configured firewall should be customized to your specific needs. The size of your business, the types of data you handle, and the tools your team uses. Without that, you’re only getting half the protection you think you have.

Setting and forgetting

This is one of the biggest mistakes of all. A firewall isn’t something you install once and walk away from. Cyberthreats change constantly. What protected you two years ago might not protect you today.

Firewalls need regular updates, just like your phone or computer. These updates address vulnerabilities and instruct the system on how to recognize new attacks. If your firewall hasn’t been updated or reviewed in a while, it may be quietly falling behind.

Relying on a home-grade router

Many businesses start out using the router provided by their internet service provider. The same type you might use at home. The issue? Home routers have very basic firewalls. They’re fine for family browsing, but not for protecting business data, customer records, or multiple employees online at once.

They often lack advanced features like:

• Intrusion prevention
• Real-time threat monitoring
• Detailed reporting and alerts

A business needs business-grade protection. It’s that simple.

No one is watching the alerts

Your firewall is constantly collecting information. Logging every blocked attempt and sending alerts if it detects something unusual. But if no one’s looking at those alerts, you might not notice a problem until it’s too late. This is why so many companies now use managed firewalls.

An IT support partner can monitor your systems on your behalf, check alerts in real-time, and address issues before they escalate into disasters.

If your business doesn’t have that kind of support, it’s worth asking: Who’s keeping an eye on your defenses right now?

Trying to do too much with one device

Some businesses rely on a single piece of equipment to handle everything. Firewall, Wi-Fi, web filtering, and more. That’s convenient, but it can also overload the system and slow down your network. When too many jobs are packed into one box, performance suffers. And sometimes, so does protection.

A better setup might separate some of those roles or use a dedicated next-generation firewall designed to handle them efficiently.

Ignoring remote workers

Lots of employees work from home or on the go. If your primary firewall doesn’t protect their devices, or if they connect through unsecured Wi-Fi, your network could still be at risk.

The best approach is to extend protection beyond the office using a cloud-based firewall, which filters traffic wherever users connect from. That way, your security perimeter moves with your people.

No regular review or testing

Even if your firewall was set up perfectly, things change. You add new software, hire new staff, expand to a second site, and every change affects your network traffic. Regular reviews help ensure your firewall’s rules still make sense.

A quick check every few months can identify gaps or outdated rules long before they become real problems.

How to choose the right firewall for your business

None of these mistakes are unusual. In fact, most companies have made one or two at some point. The key is identifying the weak spots and taking straightforward steps to address them.

A well-configured firewall is part of your business’s safety plan. And when it’s set up right, updated regularly, and monitored properly, it protects everything you’ve worked so hard to build.

Choosing a firewall means finding the right level of protection for your business. One that fits how you work, how your team connects, and what kind of data you need to protect. There’s no single “best” firewall for everyone.

Start with how your business operates

Before considering brands or features, examine how your business actually utilizes technology. Ask yourself:

• How many people are connecting to your network?
• Where do they work? All in one office, or in multiple locations?
• Do you have remote staff working from home or on the road?
• What kind of data do you handle? Financial details, personal information, or internal systems?
• Are there industry rules (like data protection standards) you need to meet?

The answers help determine what kind of firewall setup you’ll need. Whether a simple on-site device will do, or if you’ll benefit from a managed or cloud-based solution.

The smartest move you can make when choosing a firewall is to involve an expert.

Tech professionals understand how to match security tools to business needs. We assess your setup, clearly explain your options, and ensure everything is configured correctly. The right firewall is a vital part of your business’s security foundation. It’s important to get it right.

If you need advice on cybersecurity or firewalls, we’d be happy to help. Get in touch.

Information used in this article was provided by our partners at MSP Marketing Edge.