Microsoft KB Archive/928273

= Users may receive slow responses when you enable the Cache Array Routing Protocol in ISA Server 2004, Enterprise Edition =

Article ID: 928273

Article Last Modified on 12/4/2007

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APPLIES TO


 * Microsoft Internet Security and Acceleration Server 2004 Enterprise Edition

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SYMPTOMS
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.



CAUSE
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.



Hotfix information
A supported hotfix is now 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 service pack that contains this hotfix.

To resolve this problem, submit a request to Microsoft Online Customer Services to obtain the hotfix. To submit an online request to obtain the hotfix, visit the following Microsoft Web site:

http://go.microsoft.com/?linkid=6294451

Note If additional issues occur or 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. To create a separate service request, visit the following Microsoft Web site:

http://support.microsoft.com/contactus/?ws=support

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:

891024 How to obtain the latest ISA Server 2004 service pack

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.



STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the &quot;Applies to&quot; section.



MORE INFORMATION
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.

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:

Active Directory domain:

Primary DNS suffix:

In this example, the FQDN of the computer resembles the following:

Here,  is not an Active Directory domain.

For more information about domain architecture, visit the following Microsoft Web site:

http://www.microsoft.com/technet/prodtechnol/windows2000serv/technologies/activedirectory/plan/w2kdomar.mspx

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:

824684 Description of the standard terminology that is used to describe Microsoft software updates

Keywords: kbbug kbfix kbnamespace kbqfe kbauthentication kbdomain kbpubtypekc kbisa2004yes kbexpertiseadvanced kbhotfixserver KB928273

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