How to fix Azure Function App API returns Internal Server Error 500

Question

I have deployed an Azure Function App to the Azure portal and configured the function. The function runs perfectly locally, but when I try to call the function API after deployment, I receive an Internal Server Error 500. The logs show the following details:

Additionally, when I deployed the function through Azure DevOps, the function app runFromPackage path was not configured.

Could you please help me understand what might be going wrong and how I can resolve this issue?

Answer 1

Hello Harinath J,

Welcome to the Microsoft Q&A and thank you for posting your questions here.

I understand that you would like to fix Azure Function App API returns Internal Server Error 500.

Solution

An Internal Server Error 500 can occur due to various reasons such as database issues, server request timeouts, misconfigured servers, or noisy neighbor problems in a shared environment. To resolve this, you may need to check especially the three core areas below:

• Ensure your database is responding correctly and the connection strings are accurate.
• Verify all required settings are properly configured in the Azure portal.
• Look for unhandled exceptions in your code that might be causing the error.

In addition, use Application Insights to get detailed error logs and troubleshoot further. Also, regarding the runFromPackage setting, it's recommended to use WEBSITE_RUN_FROM_PACKAGE = 1 for deploying functions as it improves performance and reliability. Ensure your Azure DevOps pipeline is configured correctly with either AzureFunctionApp@1 or AzureFunctionApp@2 task for deployment.

How to solve this issue as a known issue.

Kindly use the reference links below for more detail steps and reading, some of which are from previous answers from this community and StackOverflow:

Azure Functions - Internal server error(500) - Microsoft Q&A.

Azure Function: 500 internal internal server error.

Resolve and Troubleshoot Azure web App 500 Internal Server Error.

How to Fix a 500 Internal Server Error.

Also, regarding the runFromPackage setting.

Azure function app - Internal server error 500 - Microsoft Q&A.

Azure Functions best practices | Microsoft Learn.

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Best Regards,

Sina Salam