Article ID: 970452 - View products that this article applies to.
Consider the following scenario:
In the scenario listed in this article, the RPC response packets from Exchange contain a NULL context ID. ISA Server RPC filter rejects such packets because it expects the response context ID to match the request context ID. In some scenarios, it is legitimate for an RPC server to reset the context ID.
To resolve this problem, install the hotfix rollup package that is described in the following Microsoft Knowledge Base article:
(http://support.microsoft.com/kb/970454/ )Description of the ISA Server 2004 hotfix package: June 2, 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:
(http://support.microsoft.com/kb/824684/ )Description of the standard terminology that is used to describe Microsoft software updates
Article ID: 970452 - Last Review: July 24, 2009 - Revision: 1.0