Software⏱️ 3 min read📅 2026-06-11

How to Fix: Error starting Apache with PHP module on Windows: "Cannot load php5apache2_4.dll into server: Access is denied"

Error starting Apache with PHP module on Windows: Access is denied

Quick Answer: Check file permissions and ensure the correct version of PHP is installed, as issues arise from PHP 5.5.4 onwards.

📋 Table of Contents

  1. 💡 Why You Are Getting This Error
  2. 🔧 Proven Troubleshooting Steps
  3. 🎯 Final Words

Error starting Apache with PHP module on Windows: 'Cannot load php5apache2_4.dll into server: Access is denied' occurs when attempting to install or configure Apache and PHP on Windows Vista Service Pack 2. This issue affects users who have installed the latest version of PHP, specifically PHP 5.5.7, which is not compatible with Apache's built-in PHP module.

This error can be frustrating for developers and system administrators who rely on this combination for their projects or production environments.

💡 Why You Are Getting This Error

  • The primary reason for this issue is the incompatibility between PHP 5.5.7 and the Apache HTTP Server's built-in PHP module. The 'Access is denied' error typically occurs when the Windows operating system denies access to the php5apache2_4.dll file due to incorrect permissions or conflicting library versions.
  • An alternative reason for this issue could be related to missing or corrupted DLL files, which might cause issues with the Apache and PHP modules.

🔧 Proven Troubleshooting Steps

Updating PHP to a compatible version

  1. Step 1: Download and install an earlier version of PHP that is compatible with Apache's built-in PHP module, such as PHP 5.5.3.
  2. Step 2: Verify that the downloaded PHP version is the correct thread-safe version (x86) for Windows Vista Service Pack 2.
  3. Step 3: Uninstall any existing PHP versions and reinstall the updated version.

Granting necessary permissions to the php5apache2_4.dll file

  1. Step 1: Open the File Explorer and navigate to the folder containing the php5apache2_4.dll file (C:/Program Files/PHP/php5apache2_4.dll).
  2. Step 2: Right-click on the php5apache2_4.dll file and select 'Properties'.
  3. Step 3: In the Properties window, click on the 'Security' tab and then click on 'Edit'.
  4. Step 4: Add your user account to the list of users with 'Read & Execute' permissions. You can do this by clicking on the 'Add' button at the bottom left corner of the window.
  5. Step 5: Click 'OK' to close all windows.

🎯 Final Words

To resolve the 'Cannot load php5apache2_4.dll into server: Access is denied' error, update PHP to a compatible version (e.g., PHP 5.5.3) or grant necessary permissions to the php5apache2_4.dll file. By following these steps, you should be able to successfully install and configure Apache with PHP on Windows Vista Service Pack 2.

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