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HTTP Error 500.30 - ANCM In-Process Start Failure

Introduction

Recently, while deploying a number of RESTFUL web services built-in .NET Core, to IIS was causing an HTTP Error. The services all run under the main IIS website, each in their own Application Pool. After some searching, I found that the issue was related to the AspNetCoreHostingModel been set to InProcess. This is visible in the web.config file.

The Fix

Unload the project in Visual Studio and Edit the *.csproj file. Look for the node:

<PropertyGroup>
  <AspNetCoreHostingModel>InProcess</AspNetCoreHostingModel>
</PropertyGroup>

Either remove the line AspNetCoreHostingModel or change the value to OutOfProcess

Save and reload the project. Now when you deploy the hosting model will no longer set the value 'InProcess' in the web.config file. The site should now start fine and you will no longer get the exception page

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