Azure App Service - Dotnetcore app - 500 Error - IIS was not able to access the webconfig file

IIS was not able to access the web.config file for the Web site or application. Ensure that the NTFS permissions for the web.config file are correct.

Azure App Service - Dotnetcore app - 500 Error - IIS was not able to access the webconfig file
Sanjeevi Subramani's photo
Sanjeevi Subramani

Published on Jun 21, 2021

1 min read

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When we get error: IIS was not able to access the web.config file for the Web site or application. Ensure that the NTFS permissions for the web.config file are correct on accessing an Azure app service endpoint which is hosted with dotnet core Webapp or API, you can follow this article to troubleshoot it.

Sometimes we will get following error also based on the place your code fails: 500.30

Open Advanced tools menu in the App service left menu under development tools - as shown in below image.

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Click on Go link - as highlighted in below image.

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In the new window opened - click on Debug console and then select CMD as highlighted in below image.

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Click on site folder -> then wwwroot folder. Edit the web.config file inside the folder as shown in image below.

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Copy the highlighted text in image below. (which in our case is .\SampleApp.dll)

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Then type in the following command in the cmd prompt shown below:

dotnet .\SampleApp.dll

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Then you will see the errors occurred on the app start in the console.

If there are no errors, then it will show this message:

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