Software⏱️ 2 min read📅 2026-06-03

How to Fix Error 503 Error – HTTP Error 503. The service is unavailable. App pool stops on accessing website

IIS App Pool stops unexpectedly when accessing ASP.NET website.

Quick Answer: Check IIS App Pool identity and ensure it has the necessary permissions to access the application directory.

📋 Table of Contents

  1. 💡 Why You Are Getting This Error
  2. 🚀 How to Resolve This Issue
  3. 🎯 Final Words

HTTP Error 503. The service is unavailable. App pool stops on accessing website

💡 Why You Are Getting This Error

  • Insufficient permissions or incorrect application pool settings.

🚀 How to Resolve This Issue

Method 1: Enable App Pool Recycling

  1. Step 1: Open IIS Manager, select the application pool that corresponds to your ASP.NET project and click on 'Recycle'.

Method 2: Check Application Pool Identity

  1. Step 1: Open IIS Manager, select the application pool that corresponds to your ASP.NET project and click on 'Properties'. In the 'Identity' tab, ensure that the identity of the application pool matches the identity used in your ASP.NET project.

🎯 Final Words

By following these steps, you should be able to resolve the HTTP Error 503. The service is unavailable issue and access your ASP.NET website successfully.

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