Azure API returns 500 when creating a webhook subscription on an eventgrid using pulumi

Question

Azure API returns 500 when creating a webhook subscription on an eventgrid using pulumi

Mohammad Alinia 20

Hi there,

I'm getting this error while trying to create a resource:

error: Status=500 Code="InternalServerError" Message="The operation failed due to an internal server error. The initial state of the impacted resources (if any) are restored. Please try again in few minutes. If error still persists, report 79865511-55c8-4dc1-aefd-27f28ec95ac1:12/2/2025 5:20:49 AM (UTC) to our forums for assistance or raise a support ticket ."

I have tried a few times over the course of a few days.

I am using an IaC tool (pulumi) to create/update a webhook subscription for an event grid topic. Azure API is returning a 500 with no further details.

Any ideas why this might be happing?

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2 answers

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Answer 1

Siddhesh Desai 4,895 Microsoft External Staff Moderator

Hi @Mohammad Alinia

Thank you for reaching out to Microsoft Q&A

Webhook validation: Ensure your endpoint responds correctly to Event Grid validation (POST SubscriptionValidationEvent or CloudEvents OPTIONS) and is publicly reachable during creation. Refer: https://learn.microsoft.com/azure/event-grid/troubleshoot-subscription-validation
Managed Identity auth: Configure the Event Grid subscription to use the correct audience/App ID URI and grant the identity the required permissions on the destination API.
1. https://learn.microsoft.com/azure/event-grid/deliver-events-using-managed-identity
2. https://learn.microsoft.com/azure/event-grid/secure-webhook-delivery
Cross‑tenant setup: Create the right app registration/federated identity and assign required RBAC roles on the target resource in the destination tenant. https://learn.microsoft.com/en-us/answers/questions/5638242/event-grid-cross-tenant-delivery-using-managed-ide https://learn.microsoft.com/entra/workload-id/workload-identity-federation
Network rules: Allow Event Grid through firewalls/VNets (enable Allow trusted services) or switch to system‑assigned managed identity where required. https://learn.microsoft.com/azure/event-grid/network-security https://learn.microsoft.com/azure/service-bus-messaging/service-bus-firewalls

Mohammad Alinia 20 Reputation points

2025-12-29T09:29:48.3733333+00:00
Hi Siddhesh,

Thanks for your response.

I reviewed all the above and made all the required changes but am still getting the 500.

error: Status=500 Code="InternalServerError" Message="The operation failed due to an internal server error. The initial state of the impacted resources (if any) are restored. Please try again in few minutes. If error still persists, report 8df68cfb-bfb3-4ee4-93f0-95955df212eb:12/29/2025 9:26:15 AM (UTC) to our forums for assistance or raise a support ticket ."

I suppose if there are any issues with the requests that are sent to Azure, I should have received a 4xx with an informative error message, instead of a 500, is that right?
Mohammad Alinia 20 Reputation points

2025-12-29T09:53:52.4933333+00:00

Also it might worth mentioning that we don't see any validation requests in the logs while we try to make this webhook subscription.
Siddhesh Desai 4,895 Reputation points Microsoft External Staff Moderator

2026-01-06T12:58:29.9+00:00

Hi @Mohammad Alinia ,

Can you refer to these links: Azure Event Grid – Troubleshoot subscription validation

Microsoft Q&A – Internal Server Error while creating Event Grid subscription (resolved due to IP restrictions)
Pravallika KV 12,730 Reputation points Microsoft External Staff Moderator

2026-01-09T04:00:24.2066667+00:00

Hi @Mohammad Alinia , following up to see if you had a chance to check the above response by Siddhesh and if it was helpful. Please let us know if you have any questions.

Answer 2

The error you're encountering (Status=500) indicates an internal server error when trying to create a webhook subscription for an Azure Event Grid topic. This type of error can occur for various reasons, including temporary issues with the Azure service itself or misconfigurations in the request.

Here are a few steps you can take to troubleshoot this issue:

Check Azure Status: Sometimes, Azure services may experience outages or issues. You can check the Azure status dashboard to see if there are any ongoing incidents affecting Event Grid.
Review Diagnostic Logs: Enable diagnostic settings for your Event Grid topic to capture and view logs related to publish and delivery failures. This may provide more insight into what is causing the error.
Validate Configuration: Ensure that the configuration of your webhook subscription is correct. This includes checking the webhook URL and any associated authentication settings.
Retry the Operation: Since the error message suggests trying again later, it may be a transient issue. Wait a few minutes and attempt the operation again.
Contact Support: If the issue persists, consider raising a support ticket with Azure support, providing them with the error code and the correlation ID mentioned in the error message for further assistance.

By following these steps, you may be able to identify the cause of the internal server error and resolve the issue.

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Azure API returns 500 when creating a webhook subscription on an eventgrid using pulumi

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