Azure Load Test on Private Network Stuck on Provisioning with: "Failed to provision test engines for the test run in the private network..."

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Azure Load Test on Private Network Stuck on Provisioning with: "Failed to provision test engines for the test run in the private network..."

Jason Kang 25

We're trying to set up the ability to perform Azure Load Tests on our Azure Subscription. We are testing private endpoints. We are trying a simple URL Test, but can't get past the provisioning stage. It fails with the message:

"Failed to provision test engines for the test run in the private network '___'. Refer https://aka.ms/alt/VnetTSG for troubleshooting test engine virtual network connectivity to address any network configuration issues and try again. If the issue persists, raise a support ticket along with the test run ID."

We are able to elevate ourselves to the Network Contributor and Load Test Owner roles. Is this all we need to provision the test engine VMs? Or do we need an additional role for this?

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Answer 1

Vinodh247 36,031 MVP Volunteer Moderator

Hi ,

Thanks for reaching out to Microsoft Q&A.

Use the troubleshooting guide from the error message: https://aka.ms/alt/VnetTSG

It gives precise steps for:

Verifying NSG/UDR

Outbound FQDN access

Enabling diagnostic logs on Load Testing

Minimum Working Setup Checklist

Azure Load Testing is deployed in the same region as the VNet

Load Testing resource has Managed Identity enabled

The subnet allows:

Outbound to target endpoints

  Outbound to Azure service endpoints
  
  No restrictive UDRs or NSGs blocking outbound traffic

DNS resolution works from the subnet to the private endpoin

Suggested Next Steps

Verify NSG/UDR/DNS as above

Check if you need to add "Managed Identity Operator" role temporarily to assign identity

Attempt a test from a VM in the same subnet as test engine

Review Diagnostic logs from the Load Test Resource

If issue persists, raise a ticket with Test Run ID and reference to the TSG doc

Please 'Upvote'(Thumbs-up) and 'Accept' as answer if the reply was helpful. This will be benefitting other community members who face the same issue.

Jason Kang 25 Reputation points

2025-06-25T21:44:16.2633333+00:00

Thanks for the information. We did go through the Troubleshooting Guide and opened a ticket with Microsoft. We verified our connectivity from the Virtual Network out to the Azure Load testing endpoints using a virtual machine on the virtual network. We'll check out the "Managed Identity Operator" role to see if this helps.
Vinodh247 36,031 Reputation points MVP Volunteer Moderator

2025-06-26T01:02:40.25+00:00

Sure, let me know how this goes
Jason Kang 25 Reputation points

2025-06-26T21:25:58.32+00:00

Our Azure admin tried testing this, and it's looking like there's an issue with our Edge Firewall. Our Admin was able to successfully run a test in his own virtual network once he opened up some Firewall rules. All the connectivity tests we performed from the Troubleshooting documentation passed, but there must have been something else. I'll mark this question as answered since we no know where to continue our troubleshooting.

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Azure Load Test on Private Network Stuck on Provisioning with: "Failed to provision test engines for the test run in the private network..."

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