Select the product you need help with

FIX: Role-Based Authentication Fails for Users Who Belong to Many Groups

Article ID: 321562 - View products that this article applies to.

This article was previously published under Q321562

SYMPTOMS

If a user belongs to many groups, the user cannot access a resource even if the user is a member of a group that is granted access to the resource. This problem occurs if the user belongs to many groups where the number of groups depends on the length of the group names.

You may experience this problem in the following scenarios:

You call the WindowsPrincipal.IsInRole method.
You call the User.IsInRole method.
You enable impersonation in Web applications, and you set the authentication method to BASIC or NTLM.

Back to the top | Give Feedback

CAUSE

A 2,048-byte buffer is used to store the names of the groups that each user belongs to. This problem occurs if the combined length of these group names is greater than 2,048 bytes.

Back to the top | Give Feedback

RESOLUTION

To resolve this problem, obtain the latest service pack for Microsoft .NET Framework. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:

318836

(http://support.microsoft.com/kb/318836/EN-US/ )

INFO: How to Obtain the Latest .NET Framework Service Pack

The English version of this fix should have the following file attributes or later:

   Date        Time    Version       Size       File name     
   ------------------------------------------------------------
   02-May-2002 12:25  1.0.3705.269   1,953,792  Mscorlib.dll
   02-May-2002 02:15  1.0.3705.269   2,260,992  Mscorsvr.dll
   02-May-2002 02:16  1.0.3705.269   2,256,896  Mscorwks.dll

Back to the top | Give Feedback

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 .NET Framework Service Pack 2 (SP2).

Back to the top | Give Feedback

Properties

Article ID: 321562 - Last Review: February 12, 2007 - Revision: 3.2

APPLIES TO

Microsoft .NET Framework 1.0 Service Pack 1

kbhotfixserver kbqfe kbbug kbfix kbnetframe100presp2fix kbnetframe100sp2fix KB321562

Retired KB Content Disclaimer

This article was written about products for which Microsoft no longer offers support. Therefore, this article is offered "as is" and will no longer be updated.

Back to the top | Give Feedback