Software⏱️ 3 min read📅 2026-06-15

How to Fix: Apache Error After Upgrade: Cannot load module mod_ssl.so: undefined symbol: SSL_get_srp_userinfo"

Apache error after upgrade: Cannot load module mod_ssl.so: undefined symbol: SSL_get_srp_userinfo. Missing OpenSSL library.

Quick Answer: Missing OpenSSL library is the issue, install it using apt-get or yum command.

📋 Table of Contents

  1. 🔍 Why This Happens
  2. 🛠️ Step-by-Step Verified Fixes
  3. 🎯 Final Words

Apache Error After Upgrade: Cannot load module mod_ssl.so: undefined symbol: SSL_get_srp_userinfo

This error typically affects users who have recently upgraded their Apache server to version 2.4.12, and it can be frustrating as it prevents the server from starting properly.

The error message indicates that the mod_ssl module is unable to load due to an undefined symbol, specifically SSL_get_srp_userinfo. This suggests that there may be a compatibility issue or a missing dependency in the Apache installation.

🔍 Why This Happens

  • The primary cause of this error is likely due to a change in the OpenSSL library used by Apache 2.4.12. In earlier versions, the OpenSSL library included the SSL_get_srp_userinfo function, which is no longer available in newer versions.
  • Alternatively, it's possible that there was an issue with the installation process or the configuration of the mod_ssl module.

🛠️ Step-by-Step Verified Fixes

Recompiling Apache with the correct OpenSSL version

  1. Step 1: Step 1: Download and install a compatible OpenSSL library. You can use the OpenSSL library from the official Apache website or a third-party repository.
  2. Step 2: Step 2: Recompile the Apache source code using the new OpenSSL library. This will require modifying the configure script to include the correct flags for the OpenSSL library.
  3. Step 3: Step 3: Reinstall the mod_ssl module and restart the Apache server to apply the changes.

Modifying the httpd.conf file to disable SRP authentication

  1. Step 1: Step 1: Locate the line in the httpd.conf file that enables SRP authentication. This is typically found under the SSL section.
  2. Step 2: Step 2: Comment out or remove the line that enables SRP authentication, and restart the Apache server to apply the changes.

🎯 Final Words

To resolve this error, you can try recompiling Apache with a compatible OpenSSL library or modify the httpd.conf file to disable SRP authentication. If the issue persists, it's recommended to seek further assistance from the Apache community or a qualified system administrator.

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