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What I have:
So how to resolve this? I need to see the .net exception but I have no idea how to do that.
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The HyperText Transfer Protocol (HTTP) 500 Internal Server Error server error response code indicates that the server encountered an unexpected condition that prevented it from fulfilling the request. This error response is a generic "catch-all" response.
The error 500.19 is an internal server error often occurring on a server using Microsoft IIS software. It indicates that the configuration data for the page is invalid. To solve the issue, delete the malformed XML element from the Web. config file or from the ApplicationHost.
The page cannot be displayed because an internal server error has occurred. If running on Azure, have a look at site slots. You should warm up the pages on a staging slot before swapping it to the production slot.
Try adding Application Insights to the app. You should see errors on startup of your application.
I would also take a look at your startup code to see if you are writing to disk anywhere during configuration or app.start. This might be the case if you are using AAD in any capacity.
You can also hit up the KUDU console by targetting https://sitename.scm.azurewebsites.net . You will be able to navigate in the debugging console to see the RAW logs from IIS. That might shed some light into the situation. See KUDU for more info.
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