Unable to use an existing subnet while configuring VNET Integration

Question

Unable to use an existing subnet while configuring VNET Integration

Swathi Bora 0 Microsoft Employee

Hello Team,

My client is facing issue in one environment where we are unable to configure VNET integration using existing subnet. I am able to repro this in my internal subscription as well. However, he is able to perform the same in a different environment where existing VNET and subnet are showing under App service plan connections. Could you help me to understand the difference in the views VNET

brtrach-MSFT 17,731 Reputation points Microsoft Employee Moderator

2024-03-12T03:26:55.9333333+00:00

@Swathi Bora Please let us know if the below answer was helpful by accepting it as the answer. If you have further questions or concerns, reply to this message and we will assist you further.

Michael is correct in that ensuring the vnet and web app are in the same region is the next item to ensure is properly configured.
Swathi Bora 0 Reputation points Microsoft Employee

2024-03-12T04:06:41.5633333+00:00

I have sufficient permissions and both resources are in same region, my issue is not yet resolved

2 answers

Your answer

brtrach-MSFT 17,731 Reputation points Microsoft Employee Moderator

2024-03-12T03:26:55.9333333+00:00

@Swathi Bora Please let us know if the below answer was helpful by accepting it as the answer. If you have further questions or concerns, reply to this message and we will assist you further.

Michael is correct in that ensuring the vnet and web app are in the same region is the next item to ensure is properly configured.
Swathi Bora 0 Reputation points Microsoft Employee

2024-03-12T04:06:41.5633333+00:00

I have sufficient permissions and both resources are in same region, my issue is not yet resolved

Answer 1

Michael Lee 160 Microsoft Employee

Hi,

I would check if you have enough permissions to the Vnets.

Follow these steps to check permission:

Login to Web portal
Go to the VNet > Access control (IAM) > View my access.

You need at least the following permissions to the Vnet:

https://learn.microsoft.com/en-us/azure/app-service/overview-vnet-integration#permissions

Action	Description
Microsoft.Network/virtualNetworks/read	Read the virtual network definition
Microsoft.Network/virtualNetworks/read	Read the virtual network definition
Microsoft.Network/virtualNetworks/subnets/read	Read a virtual network subnet definition
Microsoft.Network/virtualNetworks/subnets/join/action	Joins a virtual network

Regards,

Swathi Bora 0 Reputation points Microsoft Employee

2024-03-06T06:19:58.81+00:00

Thank you Michael. I have Network contributor access and based on your suggestion, created a custom role but its still the same issue, unable to use the existing subnets.
Michael Lee 160 Reputation points Microsoft Employee

2024-03-07T02:01:33.8933333+00:00

Hi Swathi,

Can you check the location of Vnet that you are trying to integrate with the func app? It should be in the same location of the func app.

Regards,

Michael

Answer 2

brtrach-MSFT 17,731 Microsoft Employee Moderator

@Swathi Bora Thank you for the update.

Can you check to ensure that:

The subnet is using an IPv4 /28 block or larger?
Note that the subnet can only be used by a single App Service Plan
No IPv6 address spaces can be defined
No service endpoint policies can be enabled

Let us know the outcome of checking on the above limitations. We look forward to your reply.

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Unable to use an existing subnet while configuring VNET Integration

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