Microsoft KB Archive/323538

= IAS Authentication Is Unsuccessful After You Install the 292053 Hotfix =

Article ID: 323538

Article Last Modified on 10/26/2006

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APPLIES TO


 * Microsoft Windows 2000 Advanced Server
 * Microsoft Windows 2000 Advanced Server
 * Microsoft Windows 2000 Advanced Server
 * Microsoft Windows 2000 Service Pack 3
 * Microsoft Windows 2000 Service Pack 2
 * Microsoft Windows 2000 Service Pack 1

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This article was previously published under Q323538





SYMPTOMS
After you install the hotfix that is described in the following Microsoft Knowledge Base (KB) article, users may no longer be able to gain remote access to the network when they authenticate against a Microsoft Internet Authentication Service (IAS) server:

292053 Can Change Expired Password Without Authorization When Using IAS or RRAS in Windows 2000



CAUSE
This problem occurs if remote user authentication is performed by an extension DLL.

Authentication and account restrictions are handled by the same component in IAS. Before you install the hotfix from KB article 292053, this component first checks to determine whether the authentication request has already been authenticated by an extension DLL. If the request has already been authenticated (the extension DLL has returned a result of &quot;raAccept&quot;), the IAS component bypasses authentication. In this scenario, IAS still enforces other account restrictions, such as &quot;account disabled&quot; or &quot;account expired.&quot;

When you install the KB article 292053 hotfix, this removes the verification test that IAS uses to determine whether authentication has been performed by an extension DLL. Therefore, even if the user is authenticated by the extension DLL, IAS tries to authenticate the user against the Windows security infrastructure. In this case, because the access request contains a Remote Authentication Dial-In User Service (RADIUS) User-Password attribute, IAS tries to perform Password Authentication Protocol (PAP) authentication. This authentication attempt is frequently unsuccessful because the submitted password is typically the user's Microsoft .NET Passport password instead of the user's Windows password.



Service Pack Information
To resolve this problem, obtain the latest service pack for Microsoft Windows 2000. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:

260910 How to Obtain the Latest Windows 2000 Service Pack

Hotfix Information
A supported fix is now available from Microsoft, but it is only intended to correct the problem that is described in this article. Apply it only to computers that are experiencing this specific problem. This fix may receive additional testing. Therefore, if you are not severely affected by this problem, Microsoft recommends that you wait for the next Windows 2000 service pack that contains this hotfix.

To resolve this problem immediately, contact Microsoft Product Support Services to obtain the fix. For a complete list of Microsoft Product Support Services phone numbers and information about support costs, visit the following Microsoft Web site:

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

NOTE: In special cases, charges that are ordinarily incurred for support calls may be canceled if a Microsoft Support Professional determines that a specific update will resolve your problem. The typical support costs will apply to additional support questions and issues that do not qualify for the specific update in question.

The English version of this fix 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.

Date        Time   Version            Size    File name - 26-Jul-2002 21:13  5.0.2195.5979     100,624  Iassam.dll



STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed at the beginning of this article. This problem was first corrected in Microsoft Windows 2000 Service Pack 4.



MORE INFORMATION
For additional information about how to obtain a hotfix for Windows 2000 Datacenter Server, click the article number below to view the article in the Microsoft Knowledge Base:

265173 The Datacenter Program and Windows 2000 Datacenter Server Product

Keywords: kbbug kbfix kbwin2000presp4fix kbqfe kbwin2ksp4fix kbhotfixserver KB323538

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