During our testing we have discovered that there is a potential to download the Cloudmark engine update even when there is not an update.

This is being looked at but for now it is recommended that you set Cloudmark to update only every 24 hours to avoid lowering your detection rate as the microupdate folder get deleted with each update.

This issue is due to how Antigen processes updates and is not due to the Cloudmark engine itself.

We believe this will be resolved with a package update and no hotfix will be needed.

*Updated to include default folder path for Cloudmark*

If you are having issues with timeouts after updating your Cloudmark engine between Friday and Saturday afternoon this post should help you out.

On Friday night we released a Cloudmark engine that had an issue being validated by scan engine test.

This results in a rollback update loop that can cause timeouts and mail flow issues on Antigen 9.x servers.

Forefront Protection for Exchange is not effected by this update.

We rolled the engine back this weekend so no new issues should occur,

if you happen to still have the bad engine on your server you will need to delete the Cloudmark engine folder manually and re-download the re-packaged update.

By default the engine folder is located at c:\Program files\Microsoft Antigen for Exchange\engines\x86\Cloudmark

If you are on a cluster the folder would be <clusterdrive>:\AntigenCluster\Engines\x86\Cloudmark

The new update should then download and resolve your issue.

Hope that helps.