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This article provides solutions to the "SubnetWithExternalResourcesCannotBeUsedByOtherResources" error code that occurs when you create, update, or scale a Microsoft Azure Kubernetes Service (AKS) cluster.
Symptoms
When attempting to create an AKS cluster or perform an "update" or "scale" operation on an existing AKS cluster, you may encounter the following error message:
Code: SubnetWithExternalResourcesCannotBeUsedByOtherResources
Error Message: Subnet <URI of subnet1> referenced by <URI of the AKS resource referencing the subnet1> cannot be used because it contains external resources. The external resources in this subnet are <URI of the external reference used by subnet1>. You need to delete these external resources before deploying into this subnet.
Cause
This error is related to the configuration of subnets. It means that you're trying to use a subnet that already has external resources associated with it for another resource. However, a subnet that has external resources associated with it isn't allowed to be used by other resources. For more information, see Effect of subnet delegation on your subnet.
Solution
If you need to use the subnet for another resource, use one of the following methods:
- Create a new subnet and associate it with the new resource.
- Delete the external references, including service association links, subnet delegations, and so on.
Contact us for help
If you have questions, you can ask Azure community support. You can also submit product feedback to Azure feedback community.