Software⏱️ 3 min read📅 2026-06-04

How to Fix: ASP.NET MVC 404 Error Handling

Properly handle 404 errors in ASP.NET MVC by configuring the HTTP error handler and checking IIS settings.

Quick Answer: Verify that the HTTP error handler is correctly configured in IIS and ensure that the custom error page is properly set up.

📋 Table of Contents

  1. 🛑 Root Causes of the Error
  2. ✅ Best Solutions to Fix It
  3. 💡 Conclusion

ASP.NET MVC developers often experience frustration when attempting to handle 404 errors in their applications. The issue you're facing is a common one, where changes made to the HTTP error handler are not reflected in the standard 404 error page.

This problem can occur due to various reasons, including incorrect configuration in IIS or issues with the ASP.NET MVC application itself.

🛑 Root Causes of the Error

  • The primary reason for this issue is that the custom HTTP error handler is not properly configured in IIS. When you made changes to the error handler as outlined in the provided links, it's possible that the new configuration was not applied correctly.
  • Another alternative cause could be issues with the ASP.NET MVC application itself, such as incorrect routing or configuration of the HTTP error handler.

✅ Best Solutions to Fix It

Configuring IIS for Custom HTTP Error Handling

  1. Step 1: Open the Internet Information Services (IIS) Manager and navigate to the 'Application Settings' section of your ASP.NET MVC application.
  2. Step 2: Select the 'HTTP Errors' option and click on the 'Edit Feature' button.
  3. Step 3: In the 'HTTP Error Codes' section, select the 404 error code and configure the custom HTTP error handler as outlined in the provided links.

Verifying ASP.NET MVC Application Configuration

  1. Step 1: Verify that the ASP.NET MVC application is correctly configured to use the custom HTTP error handler.
  2. Step 2: Check the 'web.config' file for any incorrect configuration or routing settings that may be causing issues.

💡 Conclusion

By following these steps, you should be able to resolve the issue and properly handle 404 errors in your ASP.NET MVC application. Remember to test your application thoroughly after making changes to ensure that the custom HTTP error handler is working as expected.

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