Unable to delete Load Balancers created by Azure Lab Services (Advanced Networking)

Question

Unable to delete Load Balancers created by Azure Lab Services (Advanced Networking)

Sunggyu Cho 0

After deleting two Azure Lab Services environments (with Advanced Networking),

I’m left with two Load Balancers in my subscription that cannot be deleted.

According to the error message, these Load Balancers reference VMSS resources that were part of the original lab environments,

but those VMSS instances are in a Microsoft-managed subscription and cannot be accessed or removed by me.

Since the backend pools are still pointing to those VMSS instances, the Load Balancers are stuck.

I'm requesting help from Microsoft to forcibly remove these orphaned dependencies.

I can provide full resource IDs (Load Balancer and VMSS) upon request,

but have excluded them here in case they violate Q&A posting guidelines.

Mounika Reddy Anumandla 4,300 Reputation points Microsoft External Staff

2025-03-26T06:34:23.0466667+00:00

Hi Sunggyu Cho,

Let us try some troubleshooting steps before escalating it.

To disassociate the Load Balancer from the VMSS, follow these steps:

·       Go to the Azure portal.

·       Navigate to the Load Balancer resource in your Resource Group.

·       Look for the "Backend pools" section and select the backend pool associated with the VMSS.

·       In the backend pool configuration, remove the association with the VMSS. This effectively disassociates the Load Balancer from the VMSS.

·       Save your changes.

Delete the Load Balancer: After disassociating the Load Balancer from the VMSS, you should be able to delete the Load Balancer

·       Go back to the Load Balancer resource in the Azure portal.

·       Click on the Load Balancer and look for the "Delete" button in the top menu.

·       Click it to initiate the deletion process.

·       Follow the on-screen prompts to confirm and delete the Load Balancer.

Please provide me with an update and I can help you escalating the case.
Sunggyu Cho 0 Reputation points

2025-03-26T08:48:22.26+00:00

Thank you for your response.

The VMSS is not a resource created within my subscription, so I'm unable to delete it.
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Sunggyu Cho 0 Reputation points

2025-03-28T00:25:40.29+00:00

Here is an update with additional information.
The VMSS associated with the Load Balancer's backend pool is not part of my subscription.

(It seems that when creating a Lab Service with advanced networking, Azure automatically creates a VMSS in a Microsoft-managed subscription and links that VMSS to the Load Balancer in my subscription.)

Because of this, I am unable to remove the association with the VMSS from the backend pool.

1 answer

Your answer

Mounika Reddy Anumandla 4,300 Reputation points Microsoft External Staff

2025-03-26T06:34:23.0466667+00:00

Hi Sunggyu Cho,

Let us try some troubleshooting steps before escalating it.

To disassociate the Load Balancer from the VMSS, follow these steps:

· Go to the Azure portal.

· Navigate to the Load Balancer resource in your Resource Group.

· Look for the "Backend pools" section and select the backend pool associated with the VMSS.

· In the backend pool configuration, remove the association with the VMSS. This effectively disassociates the Load Balancer from the VMSS.

· Save your changes.

Delete the Load Balancer: After disassociating the Load Balancer from the VMSS, you should be able to delete the Load Balancer

· Go back to the Load Balancer resource in the Azure portal.

· Click on the Load Balancer and look for the "Delete" button in the top menu.

· Click it to initiate the deletion process.

· Follow the on-screen prompts to confirm and delete the Load Balancer.

Please provide me with an update and I can help you escalating the case.
Sunggyu Cho 0 Reputation points

2025-03-26T08:48:22.26+00:00

Thank you for your response.

The VMSS is not a resource created within my subscription, so I'm unable to delete it.
Deleted

This comment has been deleted due to a violation of our Code of Conduct. The comment was manually reported or identified through automated detection before action was taken. Please refer to our Code of Conduct for more information.
Sunggyu Cho 0 Reputation points

2025-03-28T00:25:40.29+00:00

Here is an update with additional information.
The VMSS associated with the Load Balancer's backend pool is not part of my subscription.

(It seems that when creating a Lab Service with advanced networking, Azure automatically creates a VMSS in a Microsoft-managed subscription and links that VMSS to the Load Balancer in my subscription.)

Because of this, I am unable to remove the association with the VMSS from the backend pool.

Answer 1

Hello, @Sunggyu Cho !

What should I do if I'm unable to delete Load Balancers created by Azure Lab Services (Advanced Networking)?

If you want to delete the load balancer and your problem is that the backend pool is referencing the VMSS in the Azure Lab Subscription (ALS), then the recommendation would be to remove the backend pool from the load balancer before trying to delete it. To delete it, go to the load balancer and then the backend pools and click on the delete button there.

If you are unable to do so because the resources are in an Azure managed subscription and you are encountering an error similar to this:

Failed to delete load balancer backend pool 'mypool'.

Error: Cannot remove backend address pool mypool from load balancer since it is in use by virtual machine scale set /subscriptions/...

Please start a thread so that we can delete the resource for you.

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Unable to delete Load Balancers created by Azure Lab Services (Advanced Networking)

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