How to show trace info on custom error pages when WAF blocks a request and returns a 403?

Question

If a user does something that triggers a 403 because the WAF blocked the request, I would like to show some extra information in the custom error page that I have already set in the Application Gateway, so it will be easy to identify in the Log Analytics Workspace the blocked transaction. Is there a way to connect that transaction information to the custom error page that the user gets?

Answer 1

@del Risco Martínez, Jorge ,

Welcome to the Microsoft Q&A Platform. Thank you for reaching out & I hope you are doing well.

This feature is available in Azure Front Door.

See : Configure a custom response for Azure WAF for AFD

But not in Application Gateway as of now.

While you can still create a custom error page, you cannot create a custom error response with details from App gateway logs.

See : Create Application Gateway custom error pages

Should you be interested in this feature, you may vote in Azure Feedback Hub forum requesting this feature.

All the feedback shared in these forums are monitored and reviewed by the Microsoft engineering teams responsible for building Azure

Refer : https://feedback.azure.com/d365community/forum/8ae9bf04-8326-ec11-b6e6-000d3a4f0789

Hope this helps.

Cheers,

Kapil.