Firewalls and VPNs were once the gold standard for network security, and in many environments, they still play an important role. But with the reality of remote work, hybrid cloud infrastructure, and increasingly sophisticated attackers, traditional perimeter-based tools can no longer stand alone. The network perimeter has blurred, and broad trust assumptions no longer hold.
Unlike traditional firewalls, which assume devices inside your network are safe, ThreatLocker Network Control brings network-level zero trust to each device. It is a host-based approach that enforces least-privilege communication by default. Let’s take a look.
Why traditional network security is no longer enough
The traditional perimeter-based model is not enough as networks become more dynamic, with remote work, cloud applications, and hybrid environments. Firewalls, VPNs, and endpoint detection and response solutions have long been the backbone of endpoint and server protection, but they can’t protect the ever-increasing attack surface of businesses alone.
The truth: Traditional security measures assume too much trust. If firewalls were secure enough to thwart cyber risks, lateral movement wouldn’t occur within the environment. If VPNs were secure by default, attackers couldn’t exploit misconfigurations to gain unauthorized access.
Zero trust at the network level: The ThreatLocker approach
ThreatLocker Network Control is a host-based firewall that enforces zero trust principles: Only explicitly authorized connections are allowed—everything else is denied.
Unlike traditional firewalls that allow broad access once a device is inside the network, Network Control lets you control all network traffic at the device level. Here’s what that means in practice:
- Block all unknown traffic by default—even between internal devices.
- Only allow necessary communications—essentially eliminating lateral movement for attackers.
- Reduce reliance on VPNs and complex firewall rules by enforcing direct, device-specific policies.
- Close all the ports on your devices, making them practically invisible to attackers, and open them only to approved traffic.
- Implement Dynamic Access Control Lists (ACLs) to automatically open and close ports, ensuring only devices with authorized IP addresses interact with network resources.
Eliminate lateral movement: Stop attacks before they spread
Consider how ransomware spreads in most environments.
- Phase 1: Initial compromise—A single endpoint is infected, often through phishing or a vulnerability.
- Phase 2: Lateral movement—Malware probes the network, seeking other devices to infect.
- Phase 3: Privilege escalation and data exfiltration—Attackers access critical systems, encrypt files, or steal sensitive data.
With ThreatLocker® Network Control, Phase 2 is eliminated. The infected device can’t communicate with anything beyond what’s explicitly allowed—no scanning, no spreading, no escalation.
It’s effectively a micro-segmented, zero trust network model in which each endpoint has its own unique firewall settings, rather than relying on a perimeter-based firewall alone.
Aside from Phase 2, ThreatLocker mitigates threats in Phases 1 and 3.
- Allowlisting mitigates Phase 1 by preventing all unapproved software, including malware, from running.
- Ringfencing™, Elevation Control, and Storage Control all play individual roles in preventing lateral movement, privilege escalation, and data encryption and exfiltration. Together, these tools mitigate Phase 3.
Real-world application: securing a hybrid work environment
For IT teams managing hybrid workforces, traditional security models require:
- Extensive VPN configurations for remote access.
- A complex, ever-growing set of firewall rules.
- Trust in endpoint security solutions to detect and respond to breaches.
With ThreatLocker Network Control:
- Remote workers are only given access to predefined resources without a VPN connection.
- Server-to-server communication is explicitly defined—no open internal traffic allowed.
- Attackers who gain a foothold on one device are stopped—they can’t move beyond their initial target.
The result? An endpoint security model that actively prevents breaches, rather than reacting to them.
Your next step: Take control of your network security
Securing the network is not just about compliance; it is about embracing zero trust principles and staying ahead of attackers. The modern threat landscape demands more than reactive measures.
Traditional firewalls won’t save you from modern threats. It’s time for a zero trust, least-privilege approach to network security.
To provide your business with the security it needs and to help yourself sleep better at night, book a personalized demo with a ThreatLocker Cyber Hero® today.
ThreatLocker® is a global leader in Zero Trust endpoint security, offering cybersecurity controls to protect businesses from zero-day attacks and ransomware. ThreatLocker operates with a default deny approach to reduce the attack surface and mitigate potential cyber vulnerabilities. To learn more and start your free trial, visit ThreatLocker.com.