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Load test error ALTVNET020

Joseph Thweatt 0 Reputation points Microsoft Employee
2026-02-02T19:39:31.5333333+00:00

Provisioning fails with this error: ALTVNET020

This test is working on the private network.

Test Run Id: bd94f219-296f-43f7-969f-39e2fe7c601b

This load test provisioned successfully on Friday. There have been no changes to the Resource Group we are trying to test on. Still, the engines are not able to connect to the Engine Batch Service.

Things I have tried:

  1. Checking Service Health of Azure Batch service (no outages)
  2. Checked for changes in vnet and verified no changes to nsg rules (no changes found)
  3. Looked at logs provided in error details (no logs provided)
  4. Reviewed the subscriptions CPU quota (CPU usage is below quota)
Azure Load Testing
Azure Load Testing

An Azure service that enables developers and testers to generate insights on how to improve the performance, scalability, and capacity usage of their application

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  1. Joseph Thweatt 0 Reputation points Microsoft Employee
    2026-02-09T17:57:55.1066667+00:00

    The error was due to an internal outage impacting Load Balancer service. The portal I checked in step 1 did not tell me this, I saw it from an internal portal. Once this was fixed the load test began working again.

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  1. JimmySalian-2011 45,236 Reputation points Volunteer Moderator
    2026-02-07T13:32:12.98+00:00

    Hi Joseph,

    From the error code and without details into the setup it is difficult to provide solution, however you can check the troubleshooting steps with regards that I think you might run into some issues related to virtual network configuration and role-based access control (RBAC) permissions.

    Also with the error I suspect the subnet you have is not in ready state - The subnet you're using for the load test isn't in the Succeeded state and isn't ready to deploy your load test into it.

    Example - az network vnet subnet show -g MyResourceGroup -n MySubnet --vnet-name MyVNet

    Can you select another subnet and test?

    Hope this helps.

    JS

    ==

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