AEM Dispatcher installation and upgrade failures due to OS or dependency mismatch
Adobe Experience Manager (AEM) Dispatcher installation or upgrade fails when Apache does not start, modules do not load, or dependencies mismatch after OS, OpenSSL, or architecture updates. This issue occurs due to incompatible Dispatcher binaries with system libraries, incorrect module selection, or unsupported architecture during environment upgrades. To resolve the issue, select the correct binary, validate dependencies, and align the configuration.
Description description
Environment
Adobe Experience Manager as a Cloud Service (AEMaaCS)
Issue/Symptoms
- Apache fails to start after an upgrade due to missing libssl or libcrypto dependencies.
- The Dispatcher module does not load or loads incorrectly due to incompatible architecture.
- The environment shows errors when migrating between OpenSSL versions such as 1.1 to 3.0.
- The system shows uncertainty or mismatch for supported OS versions such as RHEL 8, RHEL 9, or Amazon Linux 2023.
Root cause
The issue occurs when the Dispatcher module does not match the system environment because it depends on specific CPU architecture, OpenSSL version, Apache build, and OS-level libraries. When the environment upgrades or changes, the existing module fails to load due to dependency mismatches, incorrect binary selection, or unsupported architecture such as ARM64 in older versions.
Resolution resolution
Follow these steps to identify the environment and install a compatible Dispatcher module.
- Identify the operating environment by checking OS, Apache, CPU architecture, and OpenSSL versions using system commands.
- Determine the correct Dispatcher package by selecting binaries based on OpenSSL version, OS, and architecture, such as ssl1.1, ssl3.0, or ARM64-supported versions.
- Download and extract the Dispatcher package on the server and confirm that the module file is available after extraction.
- Copy the Dispatcher module file to the Apache modules directory and ensure the file exists in the correct location.
- Update Apache configuration by adding the Dispatcher
LoadModuledirective with the correct module path. - Validate module dependencies by checking that all required libraries are present and match the OpenSSL version.
- Restart Apache and confirm that the Dispatcher module loads successfully without startup errors.
- Clear the Dispatcher cache after upgrades to ensure new assets load correctly and avoid stale content issues.
- Validate the resolution by running configuration checks, verifying logs, sending test requests, and confirming successful module initialization and caching behavior.
When to escalate
- The Apache service fails to start even after resolving dependencies and configuration issues.
- The Dispatcher module loads but still shows dependency or compatibility errors.
- The required Dispatcher package does not exist for the target OS or architecture.
- The environment requires unsupported configurations, such as older Dispatcher versions for ARM64.