7 Mistakes You’re Making with Your Your Network Security (And How to Fix Your Patching Strategy)

Running a business in 2026 means your network is more than just some cables and a router; it’s the central nervous system of your entire operation. But as technology evolves, so do the ways hackers try to break in. A brief run down of the current landscape reveals that many UK businesses are still falling for the same old traps, leaving the "backdoor" wide open for data breaches and ransomware.

At A500 Tech Solutions, we spend a lot of time auditing infrastructures, and we consistently see the same patterns. Whether you are a small firm or a growing enterprise, these oversights can be the difference between a normal Monday morning and a total system blackout.

Here are the seven most common mistakes you’re making with your network security, along with a roadmap to finally get your patching strategy under control.

1. Allowing Visibility Gaps in Your Hybrid Network

One of the biggest risks in modern cyber security services is "Shadow IT." As more businesses adopt a mix of cloud services, remote work tools, and on-premise hardware, the perimeter of the network has effectively vanished.

If your team is using unapproved SaaS tools or connecting personal devices to the corporate environment without your knowledge, you have a visibility gap. You cannot secure what you cannot see. When these unknown endpoints aren’t monitored, they don’t get patched. This gives threat actors an easy entry point that stays hidden from your traditional monitoring tools.

How to Secure:

Implement comprehensive monitoring across all connected devices.
Establish a strict policy for tracking and inventorying every system accessing your data.
Use tools that provide a "single pane of glass" view of your hybrid environment.

2. Operating with a Flat, Unsegmented Network

Does your guest Wi-Fi sit on the same subnet as your financial records? If the answer is yes, you’re running a "flat" network. In this configuration, once an attacker breaches one device: perhaps a vulnerable printer or a smart thermostat: they can move laterally across your entire system with ease.

A flat network turns a minor compromise into a full-scale catastrophe. Hackers know that most businesses focus on the "outer shell" of their security but leave the inside completely open.

How to Secure:

Move away from flat structures and implement microsegmentation.
Create distinct "trust zones" that isolate critical applications from general traffic.
Explore our network design services to learn how we build secure boundaries that stop lateral movement in its tracks.

3. Relying on Legacy VPN Solutions

Traditional VPNs were built for a different era of the internet. While they were once the gold standard for remote access, they often lack granular control. Once a user logs into a traditional VPN, they often have broad access to the entire network.

Recent data suggests that over 90% of security leaders are concerned about VPNs leading to breaches. If a single set of credentials is stolen, the VPN acts as a direct, encrypted tunnel for the attacker to bypass your perimeter defenses.

How to Secure:

Migrate toward Zero Trust Network Access (ZTNA).
Unlike a VPN, ZTNA limits access to specific applications rather than the whole network.
Enforce continuous verification for every single request, regardless of where it’s coming from.

4. Misconfiguring Hardware and Default Settings

We see this frequently with network hardware: devices are taken out of the box, plugged in, and left with default configurations. Whether it’s a high-end firewall or a TP-Link access point, leaving default credentials or unnecessary admin interfaces exposed is an open invitation for a breach.

At A500 Tech Solutions, we have extensive experience with various brands of network hardware, and we know that even the best equipment is only as secure as its configuration. Misconfigured DNS servers, open ports, and weak firewall rules are the "low-hanging fruit" for automated hacking scripts.

How to Secure:

Conduct regular configuration audits.
Use secure baseline templates for all new hardware deployments.
Ensure admin interfaces are only accessible via secure, authenticated internal paths.

5. Using Weak Passwords and Credentials

It’s 2026, and yet "Password123" is still making appearances in credential dumps. Automated tools can now crack simple passwords in seconds. If your employees are reusing the same password for their personal social media and their corporate login, your business is at risk.

How to Secure:

Enforce a strict password policy that requires complexity and uniqueness.
Implement a company-wide password manager to make it easier for staff to stay secure.
Educate your team on the dangers of credential stuffing and phishing.

6. Skipping Multi-Factor Authentication (MFA)

If you aren't using MFA, you are effectively leaving your front door unlocked. MFA has been proven to block over 99% of automated attacks. Relying solely on a password is no longer a viable security strategy for any business, regardless of size.

Many businesses avoid MFA because they fear it will "slow down" their employees. However, the cost of a breach far outweighs the three seconds it takes to tap a notification on a smartphone.

How to Secure:

Enable MFA on every single critical account: email, cloud storage, and banking.
Move away from SMS-based codes and use authenticator apps like Microsoft Authenticator.
Make MFA a mandatory requirement for accessing any part of your managed IT support ecosystem.

7. Leaving Unnecessary Ports and Services Open

Every open port is a potential backdoor. If you have services running that you don't actually use, you are increasing your attack surface for no reason. Remote Desktop Protocol (RDP) ports left open to the internet are one of the most common ways ransomware finds its way into a network.

How to Secure:

Audit your firewall to identify and close unused ports.
Disable unneeded services by default.
Only open remote access protocols when absolutely necessary, and always protect them with MFA and IP whitelisting.

How to Fix Your Patching Strategy

Identifying the mistakes is only half the battle. The real work lies in how you maintain your systems over time. An inconsistent patching strategy is one of the leading causes of security failures.

Here is how you can transform your approach into a proactive, resilient system:

Automate Policy Enforcement

Don't rely on manual checks. Use automated tools to ensure that patches are applied consistently across your entire infrastructure. If you leave it to individuals to "click update," it simply won't happen. Automation ensures that gaps are closed before attackers can exploit them.

Prioritise Critical Systems

Not all patches are created equal. Focus your immediate attention on "edge" devices first: firewalls, VPNs, and remote access gateways. These are the most frequently weaponised vulnerabilities. Once your perimeter is patched, move inward to your servers and workstations.

Combine Patching with Vulnerability Management

Patching shouldn't happen in a vacuum. It needs to be part of a broader cyber security service workflow. This means regularly scanning your network for vulnerabilities and misconfigurations that a simple patch might not fix.

Track, Validate, and Audit

Always track your changes. Sometimes a patch can break a legacy application. By having a clear audit trail and a validation process, you can ensure that your security updates don't compromise your business continuity. If things go wrong, you need to be able to roll back quickly or apply a workaround.

Focus on the Attack Surface

Instead of just "chasing" every new security update, focus on reducing the number of things that need patching. By disabling unnecessary services and closing unused ports, you simplify your infrastructure and make it much easier to manage.

Is Your Network Truly Secure?

Managing network security is a full-time job. Between hardware updates, software patches, and evolving threats, it’s easy for things to slip through the cracks.

At A500 Tech Solutions, we specialise in taking that burden off your shoulders. From implementing managed IT support to designing robust cyber security services, we help businesses stay ahead of the curve. Whether you're worried about your data storage security or need a complete business continuity plan, we have the expertise to help.

Don’t wait for a breach to find out where your weaknesses are. Let’s get your network secured today.