BLOG ARTICLE • 12 OCTOBER 2026 • SUGGESTED READING TIME: 6–8 MINUTES

A business installs a firewall to protect its office network. Employees can access the internet, use business apps and connect through the VPN. Everything seems to work.

But is the network still secure?

Over time, old firewall rules may remain active. Your team may delay software updates.Former employees may still have remote access. Nobody may check security alerts.

These problems can leave gaps in your network security.

A firewall is an important security tool, but installing one is not enough. You must also check its settings, control access and keep its software updated.

This guide explains how small businesses can review firewall security and reduce common network risks.

Quick Answer: How Do You Check Firewall Security?

A business firewall security checklist helps you review important settings and identify possible risks.

Start with these checks:

• Review firewall rules and remove unnecessary access after confirming it is no longer needed.
• Check open ports and services exposed to the internet.
• Install supported firmware updates according to the vendor’s guidance.
• Restrict administrator access to authorised users.
• Review VPN accounts and remote access.
• Check security logs and alerts.
• Back up the firewall configuration.
• Record changes and test them.

These steps help identify common problems. They do not guarantee complete protection against every cyberattack.

1. Why Is Installing a Firewall Not Enough?

Imagine a small business with 75 employees across two office floors.

The company has a firewall, managed switches, Wi-Fi access points and a VPN. An IT team configured the network when the office opened.

Later, the business added new applications and remote workers. Some contractors also received network access.

However, nobody reviewed the firewall rules.

An old rule may still allow traffic that the business no longer needs. A former contractor may still have a VPN account. The firewall may also run an outdated software version.

These issues can increase security risks.

The key lesson: Your firewall must match your business’s current needs. Regular reviews help you find unnecessary access and correct outdated settings.

2. Five Common Firewall Security Risks

Old or unnecessary firewall rules

Firewall rules control which connections the network allows or blocks.

Teams sometimes add temporary rules to fix application problems. They may forget to remove those rules later.

Review each rule and ask:

• What business task does it support?
• Which users or systems need access?
• Who approved the rule?
• Is the rule still necessary?

Confirm the purpose of each rule before removing it. Some applications need access only occasionally.

Unnecessary open ports

Ports allow applications and services to communicate. Some services need public access, while others should remain available only to trusted systems.

Review port-forwarding rules and services exposed to the internet. Restrict access to approved sources and destinations.

Do not open extra ports just to fix an application problem. First, identify the required connection and apply the narrowest suitable rule.

Outdated firewall firmware

Firewall vendors release updates to fix security problems and improve reliability.

Delayed updates can leave known weaknesses unresolved.

Check your firewall’s software version and vendor security notices. Follow the recommended update process. Back up the configuration and plan a recovery procedure before major changes.

If your device no longer receives vendor support, review your replacement or mitigation options.

Shared administrator accounts

Several people using one administrator account makes it difficult to track changes.

Use individual accounts where supported. Give each person only the permissions needed for their role. Enable multi-factor login verification (MFA) when available.

Restrict firewall management to approved devices or trusted management networks. Avoid exposing the administration interface directly to the public internet.

Missing security monitoring

A firewall can record blocked connections, failed logins and configuration changes. But these records help only when someone reviews them.

Make sure your firewall records important security events. Confirm that alerts reach the person responsible for network security.

Assign clear responsibility for reviewing alerts and responding to suspicious activity.

3. Small Business Firewall Security Checklist

Use this checklist during a scheduled firewall review.

Firewall rules

• Identify old, duplicate and overly broad rules.
• Confirm why each important rule exists.
• Remove unnecessary access after approval and testing.

Access controls

• Review administrator accounts and permissions.
• Remove access for former employees and contractors.
• Check VPN accounts and remote management settings.
• Enable MFA where supported.

Updates and support

• Check the installed software version.
• Review vendor security advisories.
• Confirm that the firewall remains supported.
• Plan updates and recovery steps.

Monitoring and backups

• Confirm that important security events are logged.
• Check that alerts reach the responsible team.
• Store configuration backups securely.
• Verify that the recovery process works.

Documentation

• Record approved configuration changes.
• Assign an owner to important rules.
• Document findings and follow-up actions.

This checklist provides a starting point. Your final review should reflect the firewall model, network design and security needs of your business.

4. How to Review Firewall Rules Safely

Follow a clear process before changing production settings.

Step 1: Record the current setup

List the firewall model, software version, connected networks and responsible IT owner.

Identify important business applications, VPN connections and services that depend on the firewall.

Step 2: Back up the configuration

Create a configuration backup using the vendor’s supported method.

Store it in a secure location with restricted access. Configuration files may contain sensitive network details.

Confirm that your team understands how to restore the configuration if a change causes problems.

Step 3: Check existing rules

Review rules that allow internet traffic, expose services or connect internal networks.

Confirm each rule’s purpose and business owner. Flag rules that allow more access than necessary.

Before deleting an unused rule, confirm that your business no longer needs it. Check for business dependencies first.

Step 4: Review remote access

Check VPN users, administrator accounts and third-party access.

Remove permissions that are no longer required. Confirm that remote access follows your security policies.

Step 5: Test approved changes

Document each proposed change and its expected result. Make changes during an agreed maintenance window when necessary.

Test important applications, internet access and VPN connections afterward. Record the results and correct any unexpected issues.

5. How to Check Firewall Updates and Monitoring

Firewall maintenance involves more than installing software updates.

Check the vendor’s guidance before updating the device. Confirm ability to work with other systems with connected systems and keep a usable backup.

After an update, test important network services and security controls.

You should also review firewall logs and alerts on a defined schedule. Look for repeated login failures, unexpected configuration changes and unusual traffic patterns.

Investigate suspicious activity before deciding whether it represents a threat. If you suspect a compromise, follow your incident response process and seek qualified security support.

A small business without a dedicated security team should assign these tasks to a responsible person or service provider.

6. What Should You Do If a Firewall Blocks an Application?

An application may stop working after a firewall change. The problem could involve a rule, port, DNS setting, route or another network dependency.

Do not disable security controls or allow all traffic as a quick fix.

Instead:

1. Record the affected application and when the problem started.
2. Check recent firewall changes.
3. Review relevant logs and connection errors.
4. Confirm the application’s required destinations and ports.
5. Apply an approved, narrowly scoped correction.
6. Test the application and document the result.

This process helps restore access without creating unnecessary security gaps.

For more troubleshooting guidance, read our article on cloud applications that are slow despite a fast speed test.

7. When Should You Request a Firewall Security Review?

Consider a professional review when:

• Your firewall rules have not been checked for a long time.
• Nobody knows why certain access rules exist.
• The device runs unsupported software.
• Remote access has grown without regular reviews.
• Security alerts go unchecked.
• Firewall changes frequently disrupt business applications.
• Your business needs better backup and recovery procedures.

A review can examine configuration, access controls, updates, monitoring and documentation.

The scope should match your business needs. A basic firewall review is not the same as a full security audit or penetration test.

8. How FineITServ Can Help

FineITServ helps businesses with IT infrastructure, network troubleshooting and security maintenance.

A scoped firewall review can help you understand your current setup and identify areas that need attention.

Depending on the agreed scope, the review may cover:

• Firewall rules and configuration.
• Software updates and vendor support.
• Administrator accounts and VPN access.
• Security logs and alerts.
• Configuration backups and recovery.
• Documented findings and recommended next steps.

The goal is to improve network security while keeping essential business services working.

Businesses in Bangalore and companies with several offices can review their firewalls to plan maintenance and future changes.

Explore FineITServ’s IT services or contact our team to discuss your requirements.

Frequently Asked Questions

Is a firewall enough to protect a small business?

No. A firewall is one layer of protection. Businesses also need suitable endpoint security, secure accounts, software updates, monitoring and employee awareness.

How often should a business review its firewall?

Set a regular review schedule based on risk. Also review the configuration after major network changes, new remote-access arrangements or security incidents.

What are common firewall configuration mistakes?

Common mistakes include overly broad rules, unnecessary open ports, outdated software, shared administrator accounts and poor monitoring.

Should I close every open firewall port?

No. Some applications need specific ports. Confirm the purpose of each service and its dependencies before restricting access.

Can outdated firewall software create security risks?

Yes. Unsupported software or unpatched security weaknesses may expose the device to known security problems. Follow the vendor’s security and update guidance.

What should I do if I suspect a firewall breach?

Follow your incident response process, preserve relevant logs and contact qualified security support. Avoid not recorded changes that could affect evidence or recovery.

Is a firewall checklist a complete security audit?

No. A checklist helps with routine maintenance. A formal assessment may require deeper configuration analysis, evidence collection and authorised testing.

Final Thoughts

Your firewall may be running, but your team may not be maintaining it properly.

Old rules, outdated software and unchecked remote access can create avoidable risks. Regular reviews help businesses find these issues before they cause greater problems.

Check your rules, secure administrator accounts, update supported software and review important alerts. Back up the configuration and test changes before considering the work complete.

Concerned about your office firewall? Contact FineITServ to discuss a practical network security review.