Application Gateway Load Balancer

Hello Vairamani Annamalai

To help with further troubleshooting, could you please provide the following details?

• What specific paths are you trying to route?
• What error messages are you getting please share the screenshot of the issue are being returned when accessing those paths?
• Are all backend instances marked Healthy? If Unhealthy, click the instance to see detailed error messages (e.g., timeout, 403, DNS resolution failure).

Meantime,

First of all, there are many NSG rules which are added to the app gw subnet with restrictive rules, where you needs to validate them all and make sure nothing is blocking.

can you please bypass the Application Gateway: and Access the back-end server directly on that path and see what we get.

Check where this get method is getting invoked and make sure the request URL is not using any non-RFC compliant requests. 

the request is generating an invalid method error, you need to fix the routing.

You have to make changes to the backend.

Refer: How to create application gateway with path-based routing rules using the Azure portal

Refer: https://stackoverflow.com/questions/79229531/application-gateway-path-based-routing-giving-error-for-a-configured-path

I hope this has been helpful!

If the above is unclear or you are unsure about something, please add a comment below. Please click Accept Answer and upvote if the above was helpful.

Yes, we finally found the solution. The issue was not on the load balancer side; it was on our application side. It’s now working smoothly.