In Microsoft Internet Security and Acceleration (ISA) Server 2006, you open the Traffic and Utilization report to view the Daily Traffic Summary table in the Traffic by Time of Day section. However, the Daily Traffic Summary shows an incorrect calculation for the cache hit ratio.
This problem occurs because of an incorrect calculation formula in ISA Server 2006.
To resolve this problem, install the hotfix rollup package that is described in the following Microsoft Knowledge Base article:
976301 Description of the ISA Server 2006 hotfix package: October 25, 2009
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
For more information about software update terminology, click the following article number to view the article in the Microsoft Knowledge Base:
824684 Description of the standard terminology that is used to describe Microsoft software updates