HTTP Error 500.30 - ANCM In-Process Start Failure

From ASP.NET Core 3.0+ and visual studio 19 version 16.3+ You will find section in project .csproj file are like below-

  <PropertyGroup>
    <TargetFramework>netcoreapp3.1</TargetFramework>
  </PropertyGroup>

There is no AspNetCoreHostingModel property there. You will find Hosting model selection in the properties of the project. Right-click the project name in the solution explorer. Click properties.

Click the Debug menu.

Scroll down to find the Hosting Model option.

Select Out of Process.

Save the project and run IIS Express.

UPDATE For Server Deployment:

When you publish your application in the server there is a web config file like below:

change value of 'hostingModel' from 'inprocess' to 'outofprocess' like below:

From Several Comments, I have learnt that 'OutOfProcess' is worked for them instead of 'outofprocess'.

In ASP.NET Core 2.2, a new Server/ hosting pattern was released with IIS called IIS InProcess hosting. To enable inprocess hosting, the csproj element AspNetCoreHostingModel is added to set the hostingModel to inprocess in the web.config file. Also, the web.config points to a new module called AspNetCoreModuleV2 which is required for inprocess hosting.

If the target machine you are deploying to doesn't have ANCMV2, you can't use IIS InProcess hosting. If so, the right behavior is to either install the dotnet hosting bundle to the target machine or downgrade to the AspNetCoreModule.

Source: jkotalik (Github)

Try changing the section in csproj (edit with a text editor)

  <PropertyGroup>
    <TargetFramework>netcoreapp2.2</TargetFramework>
    <AspNetCoreHostingModel>InProcess</AspNetCoreHostingModel>
  </PropertyGroup>

to the following ...

 <PropertyGroup>
    <TargetFramework>netcoreapp2.2</TargetFramework>
    <AspNetCoreHostingModel>OutOfProcess</AspNetCoreHostingModel>
    <AspNetCoreModuleName>AspNetCoreModule</AspNetCoreModuleName>
 </PropertyGroup>

Source (Github)