Coding⏱️ 2 min read📅 2026-05-31

How to Fix: IE9 jQuery AJAX with CORS returns "Access is denied"

CORS (Cross-Origin Resource Sharing) issue in IE9 with jQuery AJAX.

Quick Answer: Enable CORS in IE9 by setting jQuery.support.cors to true and using the Access-Control-Allow-Origin header in your server-side response.

📋 Table of Contents

  1. ⚠️ Common Causes
  2. 🔧 Proven Troubleshooting Steps
  3. 🎯 Final Words

The issue you're experiencing is due to Internet Explorer's (IE) restriction on CORS (Cross-Origin Resource Sharing). When using jQuery AJAX with CORS enabled, IE9 returns an 'Access is denied' error.

⚠️ Common Causes

  • IE9's CORS policy is restrictive and requires a more explicit configuration.

🔧 Proven Troubleshooting Steps

Method 1: Using the JSONP Proxy

  1. Step 1: Include a JSONP proxy in your AJAX request.

Method 2: Using the Cors-anywhere library

  1. Step 1: Install the 'cors-anywhere' library using npm or yarn.

🎯 Final Words

By implementing one of these methods, you should be able to resolve the 'Access is denied' error in IE9.

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