Article ID: 897075 - Last Review: December 4, 2007 - Revision: 3.8 Session state management may not work as expected when ISA Server 2004 accesses a Web site that uses the round robin feature of DNS to achieve load balancing
On This PageSYMPTOMSWhen Microsoft Internet Security and Acceleration (ISA) Server 2004 accesses a Web site, session state management on the Web site may not work as expected. Therefore, user data for unique sessions may not be retained. This problem occurs when the Web site is hosted on a server that uses the round robin feature of the Domain Name System (DNS) to achieve load balancing. CAUSEThis problem occurs because ISA Server cycles through the Internet Protocol (IP) addresses that are returned by the DNS query when ISA Server makes TCP connections to the Web servers. The round robin feature randomizes the IP addresses in the results of such queries. Therefore, requests are sent to different computers in the Web farm. RESOLUTIONService pack informationTo resolve this problem, obtain the latest service pack for Internet Security and Acceleration Server 2004. For more information, click the following article number to view the article in the Microsoft Knowledge Base:891024
(http://support.microsoft.com/kb/891024/
)
How to obtain the latest ISA Server 2004 service pack Hotfix InformationA supported hotfix is available from Microsoft. However, this hotfix is intended to correct only the problem that is described in this article. Apply this hotfix only to systems that are experiencing this specific problem.If the hotfix is available for download, there is a "Hotfix download available" section at the top of this Knowledge Base article. If this section does not appear, submit a request to Microsoft Customer Service and Support to obtain the hotfix. Note If additional issues occur or if any troubleshooting is required, you might have to create a separate service request. The usual support costs will apply to additional support questions and issues that do not qualify for this specific hotfix. For a complete list of Microsoft Customer Service and Support telephone numbers or to create a separate service request, visit the following Microsoft Web site: http://support.microsoft.com/contactus/?ws=support
(http://support.microsoft.com/contactus/?ws=support)
Note The "Hotfix download available" form displays the languages for which the hotfix is available. If you do not see your language, it is because a hotfix is not available for that language.PrerequisitesISA Server 2004, Standard EditionTo apply this hotfix, you must have ISA Server 2004 Standard Edition Service Pack 1 installed. For more information, click the following article number to view the article in the Microsoft Knowledge Base:891024
(http://support.microsoft.com/kb/891024/
)
How to obtain the latest ISA Server 2004 service pack
ISA Server 2004, Enterprise EditionNo prerequisites are required.Restart requirementYou do not have to restart the computer after you apply this hotfix.Hotfix replacement informationThis hotfix does not replace any other hotfixes.File informationThe English version of this fix 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 tool in Control Panel.ISA Server 2004, Standard EditionDate Time Version Size File name ------------------------------------------------------- 17-May-2005 17:04 4.0.2163.259 654,608 W3filter.dll ISA Server 2004, Enterprise EditionDate Time Version Size File name ------------------------------------------------------- 24-May-2005 05:53 4.0.3440.259 669,976 W3filter.dll STATUSMicrosoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section. This problem was first corrected in Internet Security and Acceleration Server 2004 Service Pack 2. MORE INFORMATION
For more information, click the following article number to view the article in the Microsoft Knowledge Base:
824684
(http://support.microsoft.com/kb/824684/
)
Description of the standard terminology that is used to describe Microsoft software updates
Important In ISA Server 2004, Enterprise Edition, this hotfix has no effect if the following two conditions are true:
To prevent ISA Server from cycling through IP address lists, use the following script. This script sets a value named "DNSSearchValue" in a new vendor parameters set. The default behavior occurs when DNSSearchValue equals zero or does not exist at all. Any other value for DNSSearchValue forces the proxy to use a fixed IP address. Note By using this script, you may reduce the effectiveness of the round robin feature for load balancing. Microsoft provides programming examples for illustration only, without warranty either expressed or implied. This includes, but is not limited to, the implied warranties of merchantability or fitness for a particular purpose. This article assumes that you are familiar with the programming language that is being demonstrated and with the tools that are used to create and to debug procedures. Microsoft support engineers can help explain the functionality of a particular procedure, but they will not modify these examples to provide added functionality or construct procedures to meet your specific requirements. For more information about how to install ISA Server 2004 hotfixes and updates, click the following article number to view the article in the Microsoft Knowledge Base: 885957
(http://support.microsoft.com/kb/885957/
)
How to install ISA Server hotfixes and updates
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