AspNetCoreModuleV2 and hostingModel="InProcess" in IIS sub application failing to start

IIS configuration is:

Root SPA static file application -> /api folder is an application in IIS

root app web config:

<?xml version="1.0" encoding="UTF-8"?>
<configuration>
    <system.webServer>
		<defaultDocument>
            <files>
                <clear/>
                <add value="index.html"/>
            </files>
        </defaultDocument>
		<httpErrors errorMode="Custom" existingResponse="Replace">
			<clear />
            <remove statusCode="404" subStatusCode="-1" />
            <error statusCode="404" prefixLanguageFilePath="" path="index.html" responseMode="File" />
        </httpErrors>
    </system.webServer>
</configuration>

sub app (api) web config:

<?xml version="1.0" encoding="utf-8"?>
<configuration>
  <system.webServer>
    <handlers>
      <add name="aspNetCore" path="*" verb="*" modules="AspNetCoreModuleV2" resourceType="Unspecified" />
    </handlers>
    <aspNetCore processPath="dotnet" arguments=".\eG_Control_Api.dll" stdoutLogEnabled="true" stdoutLogFile=".\logs\stdout" hostingModel="InProcess" />
    <httpErrors errorMode="Detailed" />
  </system.webServer>
</configuration>

yields api responses of HTTP Error 500.30 - Internal Server Error. changing the process model allows it to work.

event viewer shows messages along the lines of ... application ... hit unexpected managed exception, exception code = '0xe0434352'. Please check the stderr logs for more information.. Enabling stderr logs yields 0 byte files.

dotnet --info:

.NET Core SDK (reflecting any global.json):
 Version:   2.2.101
 Commit:    236713b0b7

Runtime Environment:
 OS Name:     Windows
 OS Version:  6.3.9600
 OS Platform: Windows
 RID:         win81-x64
 Base Path:   C:\Program Files\dotnet\sdk\2.2.101\

Host (useful for support):
  Version: 2.2.0
  Commit:  1249f08fed

.NET Core SDKs installed:
  2.0.0 [C:\Program Files\dotnet\sdk]
  2.2.101 [C:\Program Files\dotnet\sdk]

.NET Core runtimes installed:
  Microsoft.AspNetCore.All 2.1.0 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.All]
  Microsoft.AspNetCore.All 2.1.2 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.All]
  Microsoft.AspNetCore.All 2.1.4 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.All]
  Microsoft.AspNetCore.All 2.1.5 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.All]
  Microsoft.AspNetCore.All 2.1.6 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.All]
  Microsoft.AspNetCore.All 2.2.0 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.All]
  Microsoft.AspNetCore.App 2.1.0 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 2.1.2 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 2.1.4 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 2.1.5 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 2.1.6 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 2.2.0 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.NETCore.App 1.0.0 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 1.0.1 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 1.0.4 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 1.0.5 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 1.1.0 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 1.1.1 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 1.1.2 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 2.0.0 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 2.1.0 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 2.1.2 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 2.1.4 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 2.1.5 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 2.1.6 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 2.2.0 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]

i’ve been trying to find documentation that notes that sub applications do not function with the in process model but have been unable. the only limitation note i’ve found is that app pools are limited to a single application, to which i did separate the two apps to their own pools.

please let me know if there is any other information i can provide.

[jkotalik]

The error code you are getting means the app has reached Program.Main, but your application is throwing an exception. This doesn’t look like an issue with subapplications. Can you try adding the following to your application:

try 
{
    // Program.Main logic
}
catch (Exception ex)
{
    Console.WriteLine(ex.Message);
}

The most common issue people have been running into is the CurrentDirectory() being set to C:\Windows\System32\inetsrv rather than the app directory. Our current recommendation is to use https://github.com/aspnet/Docs/blob/master/aspnetcore/host-and-deploy/aspnet-core-module/samples_snapshot/2.x/CurrentDirectoryHelpers.cs to work around this until a future patch release.

[mikola-akbal]

I removed all from “secrets.json” and received the same problem. This JSON must have at least { } inside.