Software⏱️ 3 min read📅 2026-06-04

How to Fix Error 502 Error – HTTP Error 502.5 - ANCM Out-Of-Process Startup Failure after upgrading to ASP.NET Core 2.2

ASP.NET Core 2.2 upgrade issue

Quick Answer: Check the .NET Core SDK version and ensure it is compatible with ASP.NET Core 2.2, then try to reinstall or update the ASP.NET Core modules in Visual Studio.

📋 Table of Contents

  1. 🔍 Why This Happens
  2. 🚀 How to Resolve This Issue
  3. 💡 Conclusion

HTTP Error 502.5 - ANCM Out-Of-Process Startup Failure is an error that affects ASP.NET Core applications, causing them to fail during startup and display a generic error message in the browser.

This error can be frustrating for developers, especially when they've recently upgraded their project to ASP.NET Core 2.2. The good news is that this issue has a known solution, which we'll outline below.

🔍 Why This Happens

  • The primary cause of HTTP Error 502.5 - ANCM Out-Of-Process Startup Failure in ASP.NET Core applications is related to the way the Application Host Model (AHM) handles startup. When the AHM fails to start, it can lead to this error.
  • Another possible cause is a misconfiguration or issue with the ANCM (ASP.NET Core Module), which is responsible for hosting and managing ASP.NET Core applications.

🚀 How to Resolve This Issue

Enabling ANCM Out-Of-Process Startup

  1. Step 1: Open the terminal or command prompt and navigate to your project directory.
  2. Step 2: Run the following command to enable ANCM out-of-process startup: `dotnet build -o /bin/Release` (for .NET Core 2.2, use `/p:Configuration=Release` instead). This will allow the AHM to handle startup correctly.
  3. Step 3: Alternatively, you can also try running the application with the `--launch-profile` flag: `dotnet run --launch-profile `. This may help resolve the issue.

Configuring ANCM Settings

  1. Step 1: Open the `appsettings.json` file in your project and add the following configuration to the `` section: `{

💡 Conclusion

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