Software⏱️ 4 min read📅 2026-06-04

How to Fix 0x80004005 Error – ASP.NET Core 1.0 on IIS error 502.5 - Error Code 0x80004005

ASP.NET Core 1.0 on IIS error 502.5 - Error Code 0x80004005

Quick Answer: Check the .NET Core 1.0 RTM Windows Hosting pack for any updates or patches, and ensure that the correct version of ASP.NET Core is installed.

📋 Table of Contents

  1. 💡 Why You Are Getting This Error
  2. 🚀 How to Resolve This Issue
  3. ✨ Wrapping Up

ASP.NET Core 1.0 on IIS error 502.5 - Error Code 0x80004005 is a frustrating issue that affects developers who are trying to deploy their ASP.NET Core applications on Windows Server 2012R2 using the .NET Core 1.0 RTM Windows Hosting pack. This error occurs when the application process fails to start or stop, preventing the application from listening on the configured port. The previous RC2 version of the .NET Core 1.0 worked without any issues, making it difficult to pinpoint the exact cause of this problem.

Troubleshooting this issue requires a systematic approach, starting with checking the IIS configuration and application pool settings, followed by verifying the .NET Core runtime environment and its dependencies. By following these steps, developers can identify and resolve the root cause of this error, ensuring their ASP.NET Core applications run smoothly on Windows Server 2012R2.

💡 Why You Are Getting This Error

  • The first main reason for this error is a compatibility issue between the .NET Core 1.0 RTM Windows Hosting pack and IIS 8 or later. The RTM version of the hosting pack may not be fully compatible with the latest versions of IIS, leading to process failure or stopping issues.
  • An alternative reason could be a mismatch in the .NET Core runtime environment settings between the application pool and the web server. This can cause the application process to fail or stop unexpectedly.

🚀 How to Resolve This Issue

Configuring IIS to use the correct version of the .NET Core hosting pack

  1. Step 1: Step 1: Open the IIS Manager and select the application pool that is experiencing issues. In the Actions panel, click on 'Basic Settings' and update the '.NET CLR version' setting to 'v4.0' or 'v4.5' depending on your .NET Core version.
  2. Step 2: Step 2: Navigate to the 'Application Pool' settings and ensure that the 'Managed Pipeline Mode' is set to 'Integrated'. This will help resolve any compatibility issues with the .NET Core runtime environment.
  3. Step 3: Step 3: Verify that the correct version of the .NET Core hosting pack is installed on the server. Check the 'Add/Remove Programs' or 'Programs and Features' settings to ensure that the RTM version matches the one installed on your PC.

Verifying the .NET Core runtime environment and its dependencies

  1. Step 1: Step 1: Open the Event Viewer (Windows + R, type 'eventvwr.msc' and press Enter) and navigate to the 'Application Events' section. Look for any errors related to the application pool or .NET Core runtime environment.
  2. Step 2: Step 2: Check the 'System Event Log' for any errors related to the IIS service or the .NET Core hosting pack installation.
  3. Step 3: Step 3: Verify that all necessary dependencies, such as the .NET Framework and Visual Studio, are installed on the server. Ensure that the correct version of the .NET Framework is used (e.g., v4.0 or v4.5).

✨ Wrapping Up

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