When Internet Authentication Service receives an unknown attribute in a packet, a Windows Server 2003-based Internet Authentication Service server stops responding

Support for Windows Server 2003 ended on July 14, 2015

Microsoft ended support for Windows Server 2003 on July 14, 2015. This change has affected your software updates and security options. Learn what this means for you and how to stay protected.

This article has been archived. It is offered "as is" and will no longer be updated.
Symptoms
A Microsoft Windows Server 2003-based Microsoft Internet Authentication Service (IAS) server stops responding when IAS receives an unknown attribute in a packet.

Also, the following event message may appear in the Application log in Event Viewer:
Event Type: ErrorEvent Source: Application ErrorEvent Category: (100)Event ID: 1000Date: 12/07/2004Time: 4:38:12 AMUser: N/AComputer: <Computer_Name>Description:Faulting application svchost.exe, version 5.2.3790.0, faulting module iassam.dll, version 5.2.3790.0, fault address 0x00009ace.For more information, see Help and Support Center at http://support.microsoft.com.Data:0000: 41 70 70 6c 69 63 61 74 Applicat0008: 69 6f 6e 20 46 61 69 6c ion Fail0010: 75 72 65 20 20 73 76 63 ure svc0018: 68 6f 73 74 2e 65 78 65 host.exe0020: 20 35 2e 32 2e 33 37 39 5.2.3790028: 30 2e 30 20 69 6e 20 69 0.0 in i0030: 61 73 73 61 6d 2e 64 6c assam.dl0038: 6c 20 35 2e 32 2e 33 37 l 5.2.370040: 39 30 2e 30 20 61 74 20 90.0 at0048: 6f 66 66 73 65 74 20 30 offset 00050: 30 30 30 39 61 63 65 0009ace
Resolution

Service pack information

To resolve this problem, obtain the latest service pack for Windows Server 2003. For more information, click the following article number to view the article in the Microsoft Knowledge Base:
889100 How to obtain the latest service pack for Windows Server 2003

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

No prerequisites are required.

Restart requirement

You do not have to restart your 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.Windows Server 2003, Itanium-based versions
   Date         Time   Version            Size    File name     Platform   ---------------------------------------------------------------------   19-Apr-2005  00:15  5.2.3790.312      336,384  Iassam.dll    IA-64   19-Apr-2005  00:15  5.2.3790.312      102,400  Wiassam.dll   x86
Windows Server 2003, x86-based versions
   Date         Time   Version            Size    File name   ---------------------------------------------------------   19-Apr-2005  15:15  5.2.3790.312      102,400  Iassam.dll       
Status
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.This problem was corrected in Windows Server 2003 Service Pack 1.
More information
For more information, 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
IAS unknown attribute crash
Properties

Article ID: 894538 - Last Review: 01/16/2015 01:38:31 - Revision: 4.0

Microsoft Windows Server 2003, Standard Edition (32-bit x86), Microsoft Windows Server 2003, Web Edition, Microsoft Windows Server 2003, Enterprise Edition (32-bit x86), Microsoft Windows Server 2003, Enterprise Edition for Itanium-based Systems

  • kbnosurvey kbarchive kbautohotfix kbocabucket kbbug kbfix kbwinserv2003presp1fix kbHotfixServer kbqfe KB894538
Feedback