MS09-016: Description of the security update for ISA Server 2004: April 14, 2009

Microsoft has released security bulletin MS09-016. To view the complete security bulletin, visit one of the following Microsoft Web sites:

• Home users:
  http://www.microsoft.com/protect/computer/updates/bulletins /200904.mspx (http://www.microsoft.com/protect/computer/updates/bulletins/200904.mspx)
  Skip the details: Download the updates for your home computer or laptop from the Microsoft Update Web site now:
  http://update.microsoft.com/microsoftupdate/ (http://update.microsoft.com/microsoftupdate/)
• IT professionals:
  http://www.microsoft.com/technet/security/bulletin/ms09-016.mspx (http://www.microsoft.com/technet/security/bulletin/ms09-016.mspx)

How to obtain help and support for this security update

For home users, no-charge support is available by calling 1-866-PCSAFETY in the United States and Canada or by contacting your local Microsoft subsidiary. For more information about how to contact your local Microsoft subsidiary for support issues with security updates, visit the Microsoft International Support Web site: North American customers can also obtain instant access to unlimited no-charge e-mail support or to unlimited individual chat support by visiting the following Microsoft Web site: For enterprise customers, support for security updates is available through your usual support contacts.

This security update fixes the following issues.

Consider the following scenario:

• You configure Web publishing, Web proxy, or Automatic discovery in Microsoft Internet Security and Acceleration (ISA) Server 2004.
• A client establishes a TCP session with the corresponding listener.
• The client violates the TCP state before any data is sent.

In this scenario, ISA Server 2004 may stop accepting new requests. This problem occurs because ISA Server 2004 does not correctly manage TCP states for Web listeners.

The English (United States) version of this security update has the file attributes (or later file attributes) that are listed in the following table. The dates and times for these files are listed in Coordinated Universal Time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time item in Control Panel.

ISA Server 2004 Enterprise Edition

ISA Server 2004 Standard Edition

Prerequisites

You must have ISA Server 2004 Enterprise Edition Service Pack 3 or Standard Edition Service Pack 3 installed to apply this hotfix.

Restart requirement

You must restart the computer after you apply this hotfix.

For more information about software update terminology, click the following article number to view the article in the Microsoft Knowledge Base: