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Problems with HTTPS Requests When an ISA Server Computer Is Chained to an Upstream ISA Server Array
Article ID: 331073 - View products that this article applies to.
This article was previously published under Q331073
When you use a downstream Internet Security and Acceleration (ISA) Server computer that is chained to an upstream ISA Server array, Secure Sockets Layer (SSL) requests may not be successful, or authentication prompts may occur on the client. These problems appear only if all the following conditions are true:
Note If you use the Automatically poll upstream server for array information setting as a workaround, you may experience another issue. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:
(http://support.microsoft.com/kb/813863/ )Automatic requests for upstream server information (Get.info.v2) do not succeed when authentication is required in ISA Server
When the downstream ISA Server computer forwards an HTTP request to the upstream array, it must authenticate through NTLM first. The downstream computer sends the first part of the NTLM authentication handshake to one node of the upstream ISA Server array, and the downstream computer sends the second part to the other node of the upstream ISA Server array. Because NTLM authentication must be established on a contiguous TCP (keep-alive) connection between the downstream ISA Server array and one single node of the upstream ISA Server array, authentication to the upstream ISA Server array does not succeed, and you notice the problems that are described in the "Symptoms" section.
A 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. This hotfix might receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next software update that contains this hotfix.
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, contact 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=supportNote 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.
The English version of this hotfix has the file attributes (or later) 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.
Note You must install ISA Server Service Pack 1 before you install this hotfix.
This fix also applies to the French, German, Spanish, and Japanese versions of ISA Server.
Date Time Version Size File name -------------------------------------------------- 05-June-2003 10:35 3.0.1200.275 178,448 Mspadmin.exe 05-June-2003 10:35 3.0.1200.275 103,184 Msphlpr.dll 05-June-2003 10:34 3.0.1200.275 391,952 W3proxy.exe 05-June-2003 10:35 3.0.1200.275 299,280 Wspsrv.exe
To configure Automatically poll upstream server for array information (Get.Info.V2) on the routing rule of the downstream ISA Server computer:
Microsoft has confirmed that this is a problem in the Microsoft products that are listed at the beginning of this article.
Article ID: 331073 - Last Review: June 14, 2007 - Revision: 2.10