Article ID: 313356 - View products that this article applies to.
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When you use a secure Network Address Translation service (NAT) client computer, you may not be able to send or receive data over secondary connections for protocols that allow secondary connections if the support for the connections is provided through a program filter that supports Kernel mode data pump when:
To resolve this problem, obtain latest service pack for ISA Server 2000. For additional information about the latest service pack, click the article number below to view the article in the Microsoft Knowledge Base:
(http://support.microsoft.com/kb/313139/EN-US/ )How to Obtain the Latest Internet Security and Acceleration Server 2000 Service Pack
Microsoft has confirmed that this is a problem in the Microsoft products that are listed at the beginning of this article.
This problem was corrected in ISA Server 2000 SP1.
When you enable Internet protocol (IP) routing on an ISA server, the Kernel mode data pump feature is also enabled. This feature provides a significant performance advantage for the data-rich secondary connections by handling the traffic in Kernel mode.
Steps to Reproduce the ProblemTo reproduce the problem that is described in the Symptoms section:
Note that this problem does not occur if you disable IP routing on the downstream ISA server.
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