Application Request Routing (ARRHelper)

[RvdHout]

I have a problem with Application Request Routing (ARRHelper) on Windows 11 Professional (64-bit) behind a webfarm

After installing requestrouterhelper_x64.msi (ARR 3.0) on Windows 11 Professional (64-bit) and having a IIS application pool in 32-bit mode in classic mode (for old classic asp websites) the application pool constantly crashes triggering the JIT debugger of locally installed VS 2019 Community Edition and eventually the application pool stops resulting in a HTTP Error 503. The service is unavailable error.

Eventlog shows:

<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
<System>
  <Provider Name="Application Error" Guid="{a0e9b465-b939-57d7-b27d-95d8e925ff57}" /> 
  <EventID>1000</EventID> 
  <Version>0</Version> 
  <Level>2</Level> 
  <Task>100</Task> 
  <Opcode>0</Opcode> 
  <Keywords>0x8000000000000000</Keywords> 
  <TimeCreated SystemTime="2023-06-07T11:41:30.5526894Z" /> 
  <EventRecordID>52431</EventRecordID> 
  <Correlation /> 
  <Execution ProcessID="1688" ThreadID="11728" /> 
  <Channel>Application</Channel> 
  <Computer>ELITEDESK-MINI</Computer> 
  <Security UserID="S-1-5-20" /> 
</System>
<EventData>
  <Data Name="AppName">w3wp.exe</Data> 
  <Data Name="AppVersion">10.0.22621.1</Data> 
  <Data Name="AppTimeStamp">b182c367</Data> 
  <Data Name="ModuleName">iiscore.dll</Data> 
  <Data Name="ModuleVersion">10.0.22621.608</Data> 
  <Data Name="ModuleTimeStamp">a2e34fb2</Data> 
  <Data Name="ExceptionCode">c0000005</Data> 
  <Data Name="FaultingOffset">0000a6c9</Data> 
  <Data Name="ProcessId">0x50b0</Data> 
  <Data Name="ProcessCreationTime">0x1d99935006f8d9d</Data> 
  <Data Name="AppPath">C:\WINDOWS\SysWOW64\inetsrv\w3wp.exe</Data> 
  <Data Name="ModulePath">C:\WINDOWS\system32\inetsrv\iiscore.dll</Data> 
  <Data Name="IntegratorReportId">5b4de4ab-c269-446c-925b-f58568b95fb8</Data> 
  <Data Name="PackageFullName" /> 
  <Data Name="PackageRelativeAppId" /> 
</EventData>
</Event>

I can't reproduce the same issue on Windows Server 2019 or Wiindows 10 with requestrouterhelper_x64.msi installed and a AppPool in 32-bit mode, thus seems to be Windows 11 specific. You should be able to reproduce this issue easily.