asp.net core application deployed on IIS encounters 500 internal server error

yitian :

:( Oops 500 Internal Server Error An error occurred while starting the application.

This message appears when I add database functionality to asp.net core application and deploy it to iis. When I develop it in Visual Studio everything goes well. But after deployment, this error message appears.

I tried to use to dotnet myapp.dllrun my app in the deploy folder and found it worked fine. The problem may be related to iis. I've tried adding <compilation debug="true">..</compilation>to web.config, but that doesn't seem to work. What exactly is the problem, or is there any other way to see the detailed error message to help figure out what's going on?

set up:

  1. Change stdoutLogEnabled="false" to true and check the logs in stdoutLogFile=".\logs\stdout". The error there might tell you something.

  2. Check that the correct environment name is set using the ASPNETCORE_ENVIRONMENT environment variable , so use the correct setting (eg connection string). By default, you have a "development" environment on your computer.

  3. You can use error handling middleware to display exceptions, e.g.

    app.UseDeveloperExceptionPage();

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