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Not able to configure the private AKS cluster as backend of my Azure Application Gateway

cargobuddy 20 Reputation points
2026-03-12T05:14:13.9766667+00:00

I am struggling to configure my private AKS cluster as backend of my application gateway. Here are the facts:

  • My AKS cluster is exposing private endpoint.
  • My AKS cluster is on the same VNET as that of the Azure application gateway
  • My Application gateway is on a dedicated subnet.
  • The AGIC add-on is already enabled in the AKS cluster
  • The AGIC add-on identity already has network contributor role to the VNET and the gateway subnet.
Azure Application Gateway
Azure Application Gateway

An Azure service that provides a platform-managed, scalable, and highly available application delivery controller as a service.

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  1. Ravi Varma Mudduluru 9,200 Reputation points Microsoft External Staff Moderator
    2026-03-12T05:41:06.82+00:00

    Hello @cargobuddy,

    Thank you for reaching out to Microsoft Q&A.

    As discussed, offline, we observed that the Application Gateway was configured with only a public IP address, while the AKS cluster was deployed with private access only and does not have a public endpoint enabled.

    In this scenario, if the AKS cluster is intended to be accessed using a private IP, the Application Gateway must also have a private frontend IP configuration in addition to the public IP.

    After adding a private IP configuration to the Application Gateway and restarting the Ingress Controller, the issue was resolved.

    The AKS backend pool is now being automatically detected and populated in the Application Gateway as expected.

    Reference: https://learn.microsoft.com/en-us/azure/application-gateway/tutorial-ingress-controller-add-on-existing

    If the answer is helpful, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".

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