Azure Application gateway fails with terminal provisioning state "Failed"

Question

I am deploying azure application gateway (internal) with V2, it succeeded couple of times in other subscriptions (Environments), however, it is failing with strange error and without much details about the error.

deployment fails after 30 mins of applying/creating

there is a UDR but which is for different purpose and not blocking or restricting the default inte.net route

The deployment is using terraform and everything worked well in other instances deployment

Answer 1

I tried to reproduce the same in my environment and got the same error like below.

"details": [
    {
      "code": "Conflict",
      "message": "{\r\n  \"status\": \"Failed\",\r\n  \"error\": {\r\n    \"code\": \"ResourceDeploymentFailure\",\r\n    \"message\": \"![The resource operation completed with terminal provisioning state 'Failed](https://i.imgur.com/eipLRgp.png)'.\"\r\n  }\r\n}"
    }
  ]

This issue generally occurs, when an unsupported route typically a 0.0.0.0/0 route to a firewall being advertised via BGP is affecting the Application Gateway Su.net.

Try to deploy with a default .net and manage su.net configuration like below:

When I tried to deploy, Azure Application gateway deployment succeeded successfully like below:

If your deployment fails after 30 mins you can make use of diagnose logs to check error messages in any logs pertaining to the unsuccessful procedure.

Once you determine the cause of the issue diagnosis will guide you to take the necessary steps and fix the issue. Resolving.network issues, depending on the cause of the failure.