Internet Authentication Service (IAS) Vendor-Specific Attributes Do Not Work

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Article ID: 194957 - View products that this article applies to.
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The Internet Authentication Service Properties Profile tab allows administrators to add vendor-specific attributes. The vendor-specific attribute can be added; however, this information is not correctly passed to the NAS hardware.


The Internet Authentication Service dictionary file does not correctly store the vendor-specific attribute value.


Windows NT Server or Workstation 4.0

A fix for this problem has been included on the Windows NT 4.0 Service Pack 6 (SP6) compact disc in the Support/Ias directory; however, it is not part of the Windows NT 4.0 SP6 standard install.

Note: SP6 is NOT required to install this fix; it may be installed on a computer running Windows NT 4.0 SP4, SP5, or SP6. This fix should be applied after you install or reinstall any service pack.

To resolve this problem, obtain the latest service pack for Windows NT 4.0 or the individual software update. For information on obtaining the latest service pack, please go to:
  • Windows Service Pack Center -or-

  • 152734 how to obtain the latest windows nt 4.0 service pack
For information on obtaining the individual software update, contact Microsoft Product Support Services. 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:;EN-US;CNTACTMS

Windows NT Server 4.0, Terminal Server Edition

To resolve this problem, obtain the latest service pack for Windows NT Server 4.0, Terminal Server Edition. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:
152734 How to Obtain the Latest Windows NT 4.0 Service Pack


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 Windows NT Server version 4.0, Terminal Server Edition Service Pack 6.


Article ID: 194957 - Last Review: November 2, 2013 - Revision: 4.0
Applies to
  • Microsoft Windows NT Server 4.0 Standard Edition
  • Microsoft Commercial Internet System 2.0
  • Microsoft Windows NT Workstation 4.0 Developer Edition
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