C#•3mo ago

Minimal web API gives HTTP 500.19 error on IIS

I am trying to get a .NET 8 minimal web api up and running under IIS on Windows 11. Based on a blog post, I created a new app pool with No managed code as the CLR version[1] and assigned it to the Default Web Site. Everything else is default. Then, from Rider, I use publish to folder to publish my web api project to C:\inetpub\wwwroot. When I choose Manage website=>Browse in IIS manager I get an HTTP 500.19 error:

The requested page cannot be accessed because the related configuration data for the page is invalid.

The requested page cannot be accessed because the related configuration data for the page is invalid.

A quick search suggested this was because my web api uses appsettings.json, so I added a web.config file the project, but that made no difference. The web.config in my source is almost empty:

<?xml version="1.0" encoding="utf-8"?>

<configuration>
    <system.web>
        <compilation debug="true"  />
        <httpRuntime  />
    </system.web>
    <appSettings>
    </appSettings>
</configuration>

<?xml version="1.0" encoding="utf-8"?>

<configuration>
    <system.web>
        <compilation debug="true"  />
        <httpRuntime  />
    </system.web>
    <appSettings>
    </appSettings>
</configuration>

But after publishing it grows a little and looks like this:

<?xml version="1.0" encoding="utf-8"?>
<configuration>
  <system.web>
    <compilation debug="true" />
    <httpRuntime />
  </system.web>
  <appSettings></appSettings>
  <system.webServer>
    <handlers>
      <add name="aspNetCore" path="*" verb="*" modules="AspNetCoreModuleV2" resourceType="Unspecified" />
    </handlers>
    <aspNetCore processPath=".\Cts.Mobile.WebApi.exe" stdoutLogEnabled="false" stdoutLogFile=".\logs\stdout" hostingModel="inprocess" />
  </system.webServer>
</configuration>

<?xml version="1.0" encoding="utf-8"?>
<configuration>
  <system.web>
    <compilation debug="true" />
    <httpRuntime />
  </system.web>
  <appSettings></appSettings>
  <system.webServer>
    <handlers>
      <add name="aspNetCore" path="*" verb="*" modules="AspNetCoreModuleV2" resourceType="Unspecified" />
    </handlers>
    <aspNetCore processPath=".\Cts.Mobile.WebApi.exe" stdoutLogEnabled="false" stdoutLogFile=".\logs\stdout" hostingModel="inprocess" />
  </system.webServer>
</configuration>

Many hits on another search tell me the solution here is to remove invalid elements from the config file, but how must I know what is valid or not.

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Minimal web API gives HTTP 500.19 error on IIS