If an Enterprise Security Manager (ESM) is set up to push LiveUpdates to agents by default, it is possible that an agent may be updated to an unsupported level. To remedy this issue and revert to a previous Security Update (SU) level, it may be necessary to uninstall the ESM agent from the target machine, reinstall and manually update to the maximum supported level.
ESM agents are updated via LiveUpdate pushed from the manager that exceed the supported level on the ESM Agent support matrix, see link above.
To revert to a previous SU level, the ESM agent must first be uninstalled, then reinstalled as normal. When reinstalling the agent do not allow the agent to accept LiveUpdates from any manager that could push SUs to levels that exceed the supported agent level.
Installation of the downloaded TPK file is performed by using chmod to set the execution bit and then running the file as root.
When running the TPK file, the installation will prompt for permission to update the templates and message files on the manager. The recommendation is to only update the templates and message files on the manager to the highest SU level.
When dealing with agents at disparate SU levels, close attention must be paid to policies run on agents that are at lower SU levels than the manager's SU level, since they will be using newer message and template files. It is possible that any given message or template file will have changed resulting in unexpected behaviors and messages. By referring to the Release Notes distributed with the SU package and on the Agent SU Download page, one can reconcile the changes made from one SU and another.
Various Unix platforms, ESM versions 9.0 and up.
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