Stop 0xC000021a on Windows NT Server 4.0 with Service Pack 4

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Article ID: 200848 - View products that this article applies to.
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A Windows NT Server with Service Pack 4 experiences a STOP 0xC000021a error when you run the Windows NT Resource Kit utility, pviewer.exe, or any performance utility that attempts to gather "costly counters" against it. Costly counters are a set of four data items that can be retrieved; for example, thread details, process image names that take extra processing to get the data for.


The Winlogon process causes an access violation with a C0000005 error, which in turn causes the trap.


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:


Microsoft has confirmed that this is a problem in Windows NT 4.0 Service Pack 4. This problem was first corrected in Windows NT version 4.0 Service Pack 5.


Article ID: 200848 - Last Review: November 2, 2013 - Revision: 4.0
Applies to
  • Microsoft Windows NT Server 4.0 Standard Edition
  • Microsoft Windows NT Server 4.0 Enterprise Edition
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