Software⏱️ 3 min read📅 2026-06-11

How to Fix: Apache 2.4 with OpenSSL service failing with "specific error Incorrect function"

Apache 2.4 SSL service failure with Incorrect function error.

Quick Answer: Check if OpenSSL is properly configured and enabled for Apache 2.4, as it was in Apache 2.2.

📋 Table of Contents

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

The Apache HTTP Server with OpenSSL support can be frustrating to troubleshoot, especially when using self-signed certificates. The 'Incorrect function' error is a common issue that affects many users, causing them to restart the service repeatedly.

This error is particularly vexing because it prevents users from accessing their websites securely, which is essential for protecting user data and preventing eavesdropping. In this guide, we will walk you through the steps to resolve the 'Incorrect function' error and get your Apache server up and running with SSL support.

⚠️ Common Causes

  • The primary reason for this error is that OpenSSL has changed its API in version 1.0.2, which is incompatible with the Apache HTTP Server's OpenSSL module. This change was made to improve security and performance. As a result, users need to update their OpenSSL library or use an older version compatible with Apache 2.4.
  • Another possible cause of this error is that the OpenSSL library is not properly configured or linked during installation. In some cases, users may have missed the step to specify the OpenSSL directory or failed to link the OpenSSL library correctly.

🔧 Proven Troubleshooting Steps

Updating OpenSSL to a compatible version

  1. Step 1: Open Command Prompt as an administrator and run the following command to download the latest OpenSSL library: `winget install openssl` (for Windows 10) or `winget install openssl` (for Windows 11)
  2. Step 2: Alternatively, you can download the OpenSSL library from the official Apache website and follow the installation instructions for your operating system.
  3. Step 3: Once the new OpenSSL library is installed, restart the Apache service to apply the changes.

Configuring OpenSSL manually

  1. Step 1: Open the OpenSSL configuration file (usually located at `C:\ProgramData\Apache Software Foundation\Apache2.4\conf` on Windows 7) and add the following lines at the end of the file: `openssl_conf = C:\Path\To\OpenSSL\lib\ssl\libeay32.dll'`
  2. Step 2: Restart the Apache service to apply the changes and ensure that the new OpenSSL library is loaded.

🎯 Final Words

If you have followed these steps and still encounter issues, it may be helpful to consult the official Apache documentation or seek assistance from a Windows expert. Additionally, you can try updating your Apache server to a newer version that supports more recent versions of OpenSSL.

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