IAS Returns Incorrect Data During Invalid Logon Attempt

ID: Q226487

The information in this article applies to:

Microsoft Windows NT Server version 4.0 SP5
Microsoft Commercial Internet System version 2.0
Microsoft Internet Authentication Service

SYMPTOMS

When you apply Service Pack 5 to your computer running the Microsoft Internet Authentication service (IAS), IAS does not return an Access_reject message when an invalid logon attempt is made.

RESOLUTION

A supported fix that corrects this problem is now available from Microsoft, but it has not been fully regression tested and should be applied only to systems experiencing this specific problem.

To resolve this problem, contact Microsoft Product Support Services to obtain the fix. For a complete list of Microsoft Product Support Services phone numbers and information on support costs, please go to the following address on the World Wide Web:

http://www.microsoft.com/support/supportnet/overview/overview.asp

This hotfix corrects a problem in IAS Radius server in which Radius does not respond to an invalid authentication request with an "access_reject" packet to the Radius client. This hotfix is not included in Service Pack 6 (SP6), or in the SP6 Radius Rollup fix located on the SP6 CD-ROM in the Support\IAS folder. For additional information, click the article number below to view the article in the Microsoft Knowledge Base:

Q194957 IAS Vendor-Specific Attributes Do Not Work

You should apply the Rollup fix on the SP6 CD-ROM before installing this fix.

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


   Date      Time    Version      Size    File name     Platform
   -------------------------------------------------------------
   5/20/99   4:15pm  6.0.2723.0   9264    Authsam.dll   x86
   5/14/99   1:32am  4.00        24336    Rassapi.dll   x86

STATUS

Microsoft has confirmed this to be a problem in the Microsoft products listed at the beginning of this article.

MORE INFORMATION

For additional information about IAS, Radius, and remote authentication, please see the following articles in the Microsoft Knowledge Base:

Q197506 IAS Incorrectly Validates User Accounts

Additional query words:

Keywords : kbnetwork ntras ntsecurity ras ntsp kbbug4.00 kbfix4.00 nt4sp5fix
Version : winnt:2.0,4.0 SP5
Platform : winnt
Issue type : kbbug