Cryptographic Service Provider Not Working After Service Pack 3

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Article ID: 185253 - View products that this article applies to.
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If you install Microsoft Windows NT Service Pack 3 when Microsoft Enhanced Cryptographic Service Provider (CSP) and Microsoft CyrptoAPI versions 1.0 and 2.0 are installed on your computer, entries for the digital signature may be damaged or missing from the registry. If the CSP is not properly registered, it does not load and no error message is displayed.

The Advapi32.dll file, included with Windows NT Service Pack 3, may generate either of the following error values:

  • 0x8009001A (NTE_KEYSET_ENTRY_BAD)
  • 0x80090006 (NTE_BAD_SIGNATURE)


A fix to this problem is available that makes the necessary changes to the registry. To obtain the fix, download the appropriate self-extracting executable file:

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File nameDateSizePlatform

These files can be obtained from the following Microsoft FTP site:

Each self-extracting executable file contains the following files:

  • Readme.txt
  • Rsaenh.reg
The Readme.txt file contains instructions about how to merge the required keys into your registry, and the Rsaenh.reg file contains the registry key values needed to resolve the problem.


Microsoft has confirmed this to be a problem in Microsoft Windows NT Service Pack 3.


For more information about Microsoft Enhanced Cryptographic Service Provider and Microsoft CyrptoAPI, please see the following Microsoft Web site:

For additional information about how to download files from the Microsoft FTP site, please see the following article in the Microsoft Knowledge Base:

ARTICLE-ID: 119591
TITLE : How to Obtain Microsoft Support Files from Online Services


Article ID: 185253 - Last Review: October 31, 2006 - Revision: 1.1
  • Microsoft Windows NT Workstation 4.0 Developer Edition
  • Microsoft Windows NT Server 4.0 Standard Edition
  • Microsoft Windows NT Server 4.0 Enterprise Edition
kbprb kbprogramming kbsetup KB185253

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