Microsoft KB Archive/898553

= ISA Server 2004 may stop responding when IP addresses from multiple subnets are bound to the same adaptor =

Article ID: 898553

Article Last Modified on 12/4/2007

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APPLIES TO


 * Microsoft Internet Security and Acceleration Server 2004 Enterprise Edition
 * Microsoft Internet Security and Acceleration Server 2004 Standard Edition

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SYMPTOMS
Consider the following scenario. In Microsoft Internet Security and Acceleration (ISA) Server 2004, you configure an adaptor that has two IP addresses from two different subnets. Then, you enable an application filter, such as the remote procedure call (RPC) filter. In this scenario, ISA Server 2004 may stop responding (hang). You may also experience the following symptoms:
 * Many packets are backlogged in ISA Server 2004.
 * CPU utilization increases on the ISA Server 2004 computer.
 * The Active Directory Application Mode (ADAM) server cannot open new RPC connections to this ISA Server 2004 computer.
 * The log viewer displays various reasons for why the ADAM server cannot open these RPC connections. These reasons include the following types of errors:
 * Errors that pertain to backlogged packets
 * The &quot;FWX_E_TOO_BUSY&quot; error



CAUSE
The issue occurs when you use two IP addresses from different subnets to configure an adaptor. In this scenario, the ISA Server 2004 interpretation of the routing table differs from the interpretation that is made by the operating system. Specifically, ISA Server 2004 calculates a local IP address that is different from the real address that is used by the operating system. Therefore, ISA Server 2004 uses the wrong source IP address to create a state for the traffic. And when the traffic is inspected, no matching state is found. Therefore, ISA Server 2004 creates an additional mismatched state and then tries to resend the traffic. This process is repeated infinitely.



Service pack information
To 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 How to obtain the latest ISA Server 2004 service pack

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
If you are running ISA Server 2004, Standard Edition, you must install ISA Server 2004 Service Pack 1. 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 this hotfix.

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 tool in Control Panel.

ISA Server 2004 Standard Edition
  Date         Time   Version            Size    File name --  31-May-2005  00:48  4.0.2163.260      364,304  Msphlpr.dll

ISA Server 2004 Enterprise Edition
  Date         Time   Version            Size    File name --  27-Apr-2005  13:34  4.0.3440.260      394,008  Msphlpr.dll



STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the &quot;Applies to&quot; section. This problem was first corrected in Internet Security and Acceleration Server 2004 Service Pack 2.



MORE INFORMATION
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 How to install ISA Server hotfixes and updates

Keywords: kbqfe kbprb kbhotfixserver KB898553

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