Last Updated: March 2026

One of the most common design decisions in Microsoft Azure environments involves how administrators securely access virtual machines and internal workloads.

Traditionally, many organizations relied on VPN connections to access resources inside Azure virtual networks. However, with the introduction of Azure Bastion, Microsoft provided a modern alternative that allows administrators to connect to virtual machines directly through the Azure portal without exposing them to the internet.

Despite this, many IT professionals are still uncertain about the differences between Azure Bastion and Azure VPN Gateway, when to use each service, and which approach provides the strongest security posture.

Both services enable remote access into Azure environments, but they serve different architectural purposes. Choosing the wrong solution can introduce unnecessary complexity, security risks, or operational overhead.

In this guide, we’ll break down the key differences between Azure Bastion and VPN Gateway, explain how each service works, and provide real-world insights into when each solution makes the most sense in enterprise Azure deployments.

Quick Fix Summary

If you need a quick answer when deciding between Azure Bastion and VPN Gateway:

• Use Azure Bastion for secure browser-based RDP/SSH access to virtual machines.
• Use VPN Gateway when users or networks need full connectivity to Azure virtual networks.
• Bastion eliminates the need for public IP addresses on VMs.
• VPN Gateway supports site-to-site and point-to-site connectivity.
• Many enterprise environments use both solutions together.

Understanding the Key Differences

Before comparing the services in detail, it’s important to understand what each solution is designed to do.

Azure Bastion

Azure Bastion is a managed jump host service that allows administrators to connect to virtual machines via RDP or SSH directly through the Azure portal.

Connections are established through a secure HTML5 session running inside the browser.

This eliminates the need to expose VM management ports like:

• RDP (3389)
• SSH (22)

to the public internet.

Azure VPN Gateway

Azure VPN Gateway is a network-level connectivity service that allows users, devices, or entire networks to securely connect to Azure virtual networks.

VPN Gateway supports several connection types:

• Site-to-Site VPN
• Point-to-Site VPN
• VNet-to-VNet connections

Unlike Bastion, VPN Gateway provides full network connectivity, not just administrative access to virtual machines.

Azure Bastion: How It Works

Azure Bastion is deployed inside a dedicated subnet called:

AzureBastionSubnet

Once deployed, it acts as a secure proxy between the administrator and the target VM.

Connection Flow

1. Admin logs into Azure Portal
2. Admin selects the virtual machine
3. Clicks Connect > Bastion
4. RDP or SSH session launches in the browser

Traffic flows through the Bastion host rather than directly to the VM.

Key Security Advantages

• No public IP required on VMs
• RDP/SSH ports remain closed to the internet
• Traffic stays within Azure’s private network
• Reduced attack surface

This significantly improves security compared to exposing RDP directly to the internet.

Azure VPN Gateway: How It Works

VPN Gateway establishes encrypted tunnels between external networks and Azure.

Typical use cases include:

• Remote employee access
• Branch office connectivity
• Hybrid cloud networking

Connection Types

Point-to-Site (P2S)

Individual users connect using VPN clients.

Common scenario:

• IT administrators connecting from laptops.

Site-to-Site (S2S)

Entire on-premises networks connect to Azure via VPN appliances.

Example:

Corporate Office Network
        │
        │ VPN Tunnel
        │
Azure Virtual Network

This allows seamless communication between environments.

Step-by-Step: When to Use Azure Bastion

Scenario 1: Secure VM Administration

If your goal is simply secure remote administration of virtual machines, Bastion is usually the best option.

Advantages include:

• No VPN client required
• No public IP exposure
• Quick setup

Example Deployment Steps

1. Create Bastion resource in Azure
2. Deploy inside AzureBastionSubnet
3. Remove public IPs from VMs
4. Connect through Azure portal

This architecture is commonly used in DevOps and production cloud environments.

Scenario 2: Locking Down RDP and SSH

Many security audits flag open ports such as:

• TCP 3389
• TCP 22

Azure Bastion allows administrators to close these ports entirely while still maintaining access.

This approach aligns with zero trust networking principles.

Step-by-Step: When to Use VPN Gateway

Scenario 1: Hybrid Cloud Networking

Organizations connecting on-premises infrastructure to Azure require VPN Gateway.

This allows internal systems to communicate with Azure workloads.

Typical example:

On-Prem AD Domain
        │
   VPN Tunnel
        │
Azure VMs

This enables services such as:

• Active Directory replication
• application connectivity
• database access

Scenario 2: Remote Workforce Connectivity

Point-to-site VPN allows employees to securely access internal Azure resources from anywhere.

This is commonly used for:

• developers
• IT administrators
• support engineers

VPN Gateway integrates with identity providers and supports certificate-based authentication.

Real-World Enterprise Architecture

In large Azure environments, the best solution is often not choosing one service over the other—but using both.

Typical enterprise design:

• VPN Gateway provides network connectivity
• Azure Bastion provides secure administrative access

Example architecture:

Admin Laptop
     │
 VPN Gateway
     │
Azure Virtual Network
     │
Azure Bastion
     │
Virtual Machines

This layered design improves both security and operational flexibility.

Additional Tips for Secure Azure Remote Access

Avoid Public IP Addresses on Virtual Machines

One of the most common security mistakes is assigning public IPs directly to VMs.

Instead:

• Use Bastion
• Use VPN access
• Restrict access with private networking

Use Network Security Groups (NSGs)

Even with Bastion or VPN access, network security groups should restrict unnecessary traffic.

Example rules:

• Allow RDP only from Bastion subnet
• Block all inbound internet traffic

Monitor Access Activity

Enable logging through:

• Azure Monitor
• Network Watcher
• Defender for Cloud

Monitoring helps detect suspicious login activity or abnormal connection patterns.

FAQ

Is Azure Bastion more secure than VPN Gateway?

Azure Bastion reduces the attack surface by eliminating public RDP/SSH exposure. However, VPN Gateway is necessary when full network connectivity is required.

Can Azure Bastion replace VPN Gateway?

Not entirely. Bastion provides secure administrative access to VMs, while VPN Gateway provides broader network connectivity.

Does Azure Bastion require a public IP?

The Bastion service itself uses a public endpoint, but virtual machines do not require public IP addresses.

Is Azure Bastion expensive?

Azure Bastion costs more than basic VM access methods, but many organizations consider the cost worthwhile due to the improved security posture.

Can Bastion and VPN Gateway be used together?

Yes. Many enterprise Azure architectures use both services together to provide secure access and hybrid connectivity.

Conclusion

Choosing between Azure Bastion and VPN Gateway depends largely on how users need to access Azure resources.

Azure Bastion is ideal for secure, browser-based administration of virtual machines without exposing management ports to the internet. Meanwhile, VPN Gateway enables full network connectivity between users, offices, and Azure virtual networks.

In modern enterprise cloud environments, these technologies are often used together to create a layered security model that balances accessibility with protection.

For IT professionals designing Azure infrastructure, understanding when and how to use these services is essential for building secure, scalable, and maintainable cloud environments.

Last Updated

Last Updated: March 2026

This guide reflects the latest Azure networking and security best practices for remote access to cloud infrastructure.

Daniel Lutton

From my early days on the helpdesk through roles as a service desk manager, systems administrator, and network engineer, I’ve spent more than 25 years in the IT world. As I transition into cyber security, my goal is to make tech a little less confusing by sharing what I’ve learned and helping others wherever I can.