Microsoft Azure is making a significant networking change that can quietly break outbound Internet connectivity for newly deployed virtual machines if you’re relying on legacy defaults. The retirement of Default Outbound Access is scheduled for March 31, 2026—and if you build (or redeploy) VMs the “old way” after that date, they may no longer be able to reach the Internet unless you configure outbound explicitly.
What is “Default Outbound Access”?
Historically, Azure virtual machines deployed into a Virtual Network (VNet) could sometimes reach the Internet without you setting up any specific outbound path. Azure would provide outbound connectivity using a shared, non-deterministic public IP behind the scenes. It was convenient—but from a security and operational standpoint, it can be hard to control, audit, and troubleshoot.
What’s changing on March 31, 2026?
Starting March 31, 2026, Azure will permanently retire Default Outbound Access. Any new VM (or redeployed VM) that depends on this implicit behavior could lose outbound Internet connectivity—which can lead to failed updates, broken package installs, telemetry gaps, inability to reach external APIs, and service disruption.
Are existing VMs impacted?
Existing virtual machines and network resources deployed before March 31, 2026 are not expected to be immediately impacted—their outbound access should continue to function. However, relying on legacy implicit behavior is not a long-term strategy. Treat this as a planned modernization effort to align with Azure networking and security best practices.
Three ways to replace Default Outbound Access
1) Assign a Public IP directly to the VM
This is the simplest approach and can be cost-effective for very small or temporary environments. The trade-off is that the VM becomes directly addressable from the Internet, which can increase exposure and typically requires tighter hardening, network security rules, and operational controls.
2) Use a NAT Gateway (recommended for most scenarios)
A NAT Gateway provides dedicated, predictable outbound connectivity for all VMs in a subnet—without exposing the VMs directly to the Internet. It’s a strong default choice when you want scalable outbound, a stable public IP, and a cleaner security posture.
3) Configure outbound rules on an Azure Standard Load Balancer
If you already have an Azure Standard Load Balancer in place, outbound rules can be used to provide and control Internet egress for backend pool VMs. This option is especially relevant in architectures that already depend on a load balancer for inbound traffic and want to consolidate networking components.
What you should do now (practical checklist)
- Inventory virtual machines and workloads that may rely on implicit outbound connectivity (the Azure portal and Azure Advisor can help flag them).
- For new deployments, update your landing zones / templates now so outbound is always explicit (Public IP, NAT Gateway, or Standard Load Balancer outbound rules).
- Test your chosen approach in a non-production environment, including OS updates, package repositories, external API calls, and backup/monitoring agents.
- For existing environments, plan a phased upgrade even if you’re not immediately impacted—this reduces risk and aligns with best practices.
- Communicate with stakeholders and clients early so the change is understood, budgeted, and scheduled.
Bottom line
The Default Outbound Access retirement is one of those changes that’s easy to miss—until a deployment suddenly can’t reach the Internet. By making outbound connectivity explicit now, you’ll avoid surprise outages, improve security, and standardize how your Azure workloads connect out. For official details, see the Microsoft Learn link earlier in this document.
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