How to Migrate from VPN and Firewalls to the Zscaler Zero Trust Exchange

The Zscaler Zero Trust Exchange is a cloud native zero trust platform that brokers secure connections between users, workloads, devices, and applications based on least-privileged access. Instead of extending a trusted network, it verifies identity, determines destination, assesses risk, and enforces policy in real time—per session, per request. It’s designed to inspect traffic at scale, including encrypted TLS/SSL traffic, using a proxy-based approach.

In practice, the platform acts like an intelligent switchboard: it uses identity, context, and business policies to create one-to-one connections between an authorized entity and a specific app. This differs from VPNs and firewalls because it doesn’t put users “on the network” or rely on perimeter defenses. Applications can be hidden behind the exchange, reducing exposure, while access is granted directly to the app rather than to broad network segments.

As mobility, cloud adoption, and distributed work become the norm, perimeter-centric tools struggle to keep up. The result is higher risk, heavier operational load, and performance bottlenecks that frustrate users and security teams alike.

Inherent Exposure and a Larger Attack Surface

Traditional architectures expose IPs and services to the internet, giving attackers something to discover and probe. VPN and firewall footprints can become targets themselves, creating risk before a user even authenticates. Once exposed, a single weakness can become an entry point.

Lateral Movement Once Attackers Get In

VPNs commonly connect users to a network, not just an app, which increases the blast radius after compromise. If an attacker gains a foothold, moving laterally to other resources becomes easier. This is a core reason “network access” is such a dangerous default.

Poor User Experience from Backhauling and Heavy Clients

Legacy remote access often backhauls traffic through data centers, adding latency and instability. Resource-heavy clients and unreliable connections slow productivity, especially for hybrid users who need fast access from anywhere. The cloud-first world punishes architectures that weren’t built for proximity and scale.

Operational Complexity and High Overhead

Maintaining VPN and firewall environments requires ongoing patching, troubleshooting, routing changes, and hardware lifecycle planning. That complexity compounds during expansions, cloud migrations, and M&A activity. Over time, teams end up managing the perimeter instead of improving security outcomes.

The Zero Trust Exchange helps replace perimeter-based remote access with a cloud native model that connects users directly to applications based on identity, context, and policy. The result is reduced exposure, tighter access control, and a simpler path to secure access for users and workloads—without extending the network.

• Reduce the attack surface by removing inbound exposure: Keep private apps and resources off the internet by eliminating public-facing access paths tied to VPN gateways and firewall rules.
• Stop lateral movement with app-level access: Provide least-privileged, user-to-app connectivity instead of placing users “on the network,” limiting blast radius after compromise.
• Improve user experience with local, cloud-delivered access: Enable faster, more consistent access by connecting through the nearest cloud points of presence rather than backhauling to a data center.
• Enforce consistent policy using identity and context: Make access decisions using user identity, device posture, destination, and risk—applied in real time per session/request.
• Simplify operations and scale without appliance sprawl: Reduce dependency on VPN/firewall infrastructure and the overhead of hardware life cycle management, patching, and complex routing changes.

A successful migration is less about “ripping and replacing” and more about sequencing: understand what you have, define who needs what, enforce least privilege, and optimize continuously. The steps below align to a zero trust approach where identity, context, and policy drive access—not network location.

Step 1: Assess Your Current IT Infrastructure

Inventory existing VPN, firewall, and remote access dependencies, including where traffic is hairpinned or backhauled. Identify where risk concentrates (publicly exposed services, brittle routing, legacy segments). This establishes a baseline for both security and performance improvements.

Step 2: Map Business Applications and Workflows

Document which apps matter most—private apps, SaaS, and partner-connected systems—and how users actually access them. Clarify who needs access, from where, and under what conditions. This prevents over-permissioning and sets you up for user-to-app access instead of network-wide access.

Step 3: Define Zero Trust Policies for Users and Applications

Create policies based on least-privileged access: grant only what’s needed, session by session, request by request. Use identity and context (user, device posture, destination, behavior) to decide whether to allow, block, isolate, or otherwise control access. This policy layer replaces “trusted network” assumptions with explicit verification.

Step 4: Deploy the Zero Trust Exchange Across the Network

Roll out the platform to broker one-to-one connections between authorized entities and apps. Instead of routing users into the network, you connect them directly to applications, reducing exposure and preventing lateral movement. This is the architectural pivot away from hub-and-spoke perimeter dependency.

Step 5: Integrate Identity and Access Management (IAM)

Integrate with third-party identity providers so the platform can verify users and devices consistently. Through IAM, identity becomes the control plane, not IP addresses or subnets. This also supports more consistent policy enforcement across HQ, branch, and remote users.

Step 6: Test, Monitor, and Optimize Network Performance

Validate access paths and confirm low-latency connectivity through the closest points of presence rather than the data center. Monitor experience and security outcomes continuously, then refine policies as workflows change. Optimization becomes ongoing—because zero trust is enforced in real time.

A migration works best when it’s treated like a behavior change, not a single technology swap. Plan to reduce risk early, keep users productive, and iterate toward least privilege with measurable checkpoints.

• Start with high-impact apps and user groups: Migrate the most-used private apps and key remote workflows first to show immediate productivity gains and reduce VPN dependency quickly.
• Connect users to apps, not the network: Design access around specific applications to minimize lateral movement and avoid recreating old network trust in a new tool.
• Use consistent, policy-driven enforcement: Define identity- and context-based policies up front and apply them uniformly across locations to avoid exceptions that become future vulnerabilities.
• Measure both security and experience: Track reduced exposure, blocked threats, and fewer policy violations alongside latency and user satisfaction, then tune based on real usage.

Zscaler’s approach is built to reduce risk across the attack chain while improving access for users everywhere. By hiding apps behind the platform, inspecting traffic (including encrypted traffic) at scale, and brokering direct app access based on identity and policy, organizations can simplify operations and modernize securely.

• Minimize the attack surface by making applications invisible to the internet behind the exchange.
• Prevent compromise with real-time threat blocking and full TLS/SSL inspection at scale.
• Eliminate lateral movement by connecting authorized users directly to apps, not to the network.
• Improve performance by providing direct access through the closest points of presence—without data center backhauling.

Ready to modernize remote access and retire VPN/firewall sprawl? Request a demo of the Zscaler Zero Trust Exchange today.