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You cannot download files from a SharePoint Web site when Forefront Security for SharePoint is installed, and you receive an "Unknown Error" error message
Article ID: 968163 - View products that this article applies to.
When you try to download a file from a SharePoint server that is running Microsoft Forefront Security for SharePoint, the file may be blocked. This may also occur if you try to upload the file.
In this case, you may also receive the following error message on the Web console:
This problem occurs because SharePoint does not provide sufficient time for Forefront Security for SharePoint to scan a file.
To resolve this issue, install Forefront Security for SharePoint Service Pack 3 (SP3). For more information, click the following article number to view the article in the Microsoft Knowledge Base:
(http://support.microsoft.com/kb/967995/ )Description of Forefront Security for SharePoint with Service Pack 3
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
Article ID: 968163 - Last Review: July 1, 2009 - Revision: 1.0