When a server is running Microsoft Internet Security and Acceleration (ISA) Server 2004, Enterprise Edition, users who access intranet Web sites may receive slow responses. Additionally, the domain controllers may receive excessive authentication requests from the computer that is running ISA Server.

This problem occurs if the following conditions are true:

•	You have enabled the Cache Array Routing Protocol (CARP) in the ISA Server array.
•	The members of the array belong to an Active Directory domain.
•	The computer names of the array members are configured in a disjoint namespace.

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This problem occurs because ISA Server passes incorrect authentication information to the Simple and Protected GSSAPI Negotiation Mechanism (SPNEGO). Therefore, SPNEGO issues an invalid Kerberos ticket request. When SPNEGO cannot obtain a Kerberos ticket for the target server, it uses NTLM authentication. Because of the additional NTLM authentication requests, HTTP requests may generate very long response times.

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Hotfix information

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: 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.

Prerequisites

To apply this hotfix, you must have Microsoft ISA Server 2004 Enterprise Edition Service Pack 2 (SP2) installed. For more information, click the following article number to view the article in the Microsoft Knowledge Base:

Restart requirement

You do not have to restart the computer after you apply the hotfix. However, the installer will restart the Microsoft ISA Server Control service and its dependent services.

Hotfix replacement information

This hotfix does not replace any other hotfixes.

File information

The English version of this hotfix 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.

File name	File version	File size	Date	Time	Platform
Comphp.dll	4.0.3443.631	167,784	12-Nov-2006	06:16	x86
Complp.dll	4.0.3443.631	63,336	12-Nov-2006	06:16	x86
Cookieauthfilter.dll	4.0.3443.631	159,592	12-Nov-2006	06:16	x86
msfpc.dll	4.0.3443.631	377,192	12-Nov-2006	06:16	x86
msfpccom.dll	4.0.3443.631	5,024,104	12-Nov-2006	06:16	x86
msfpcui.dll	4.0.3443.631	2,420,584	12-Nov-2006	06:16	x86
ratlib.dll	4.0.3443.631	40,808	12-Nov-2006	06:16	x86
msfpcsnp.dll	4.0.3443.631	4,656,488	12-Nov-2006	06:16	x86
mspadmin.exe	4.0.3443.631	282,984	12-Nov-2006	06:16	x86
msphlpr.dll	4.0.3443.631	405,352	12-Nov-2006	06:16	x86
mspmon.dll	4.0.3443.631	52,584	12-Nov-2006	06:16	x86
mspmsg.dll	4.0.3443.631	254,312	12-Nov-2006	06:16	x86
rpcfltr.dll	4.0.3443.631	130,920	12-Nov-2006	06:16	x86
socksflt.dll	4.0.3443.631	95,592	12-Nov-2006	06:16	x86
w3filter.dll	4.0.3443.631	753,512	12-Nov-2006	06:16	x86
wspsrv.exe	4.0.3443.631	1,067,368	12-Nov-2006	06:16	x86
Linktranslation.dll	4.0.3443.631	123,752	12-Nov-2006	06:16	x86

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Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

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NTLM authentication puts additional load on the domain controller. This may cause remote procedure call (RPC) time-outs and Net Logon time-outs. The authentication delay causes slow response times.

The server may also fail over to another domain controller. If the other domain controller is not local, response times are even slower.

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Disjoint namespaces

When you use a primary domain name system (DNS) suffix that does not represent an Active Directory domain, the domain namespace is a disjoint namespace. For example, the following represents a disjoint namespace: In this example, the FQDN of the computer resembles the following:Here, Sub-domain is not an Active Directory domain.

For more information about domain architecture, visit the following Microsoft Web site:For more information about the terms that are used to describe software updates, click the following article number to view the article in the Microsoft Knowledge Base:

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