Article ID: 947254 - Last Review: February 13, 2008 - Revision: 1.2

A computer that is running ISA Server 2006 may randomly stop routing packets from certain VPN clients or from certain VPN site-to-site networks

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SYMPTOMS

A computer that is running Microsoft Internet Security and Acceleration (ISA) Server 2006 may randomly stop routing packets from certain VPN clients or from certain VPN site-to-site networks. This problem makes network destinations unreachable for affected clients and for affected branch office networks.

Note When this problem occurs, other VPN clients and other VPN site-to-site networks do not experience this symptom.
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CAUSE

This problem may occur because the Microsoft Firewall service makes incorrect routing decisions for VPN virtual interfaces.
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RESOLUTION

To resolve this problem, apply the hotfix rollup package that is described in the following Microsoft Knowledge Base article:
947257  (http://support.microsoft.com/kb/947257/ ) Description of the Internet Security and Acceleration (ISA) Server 2006 hotfix package: January 8, 2008
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STATUS

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
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APPLIES TO
  • Microsoft Internet Security and Acceleration Server 2006 Enterprise Edition
  • Microsoft Internet Security and Acceleration Server 2006 Standard Edition
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Keywords: 
kbqfe kbexpertiseinter KB947254
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