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Q143138: Can No Longer Access the Registry with Null Sessions

Article: Q143138
Product(s): Microsoft Windows NT
Version(s): 4.0
Operating System(s): 
Keyword(s): kb3rdparty
Last Modified: 08-AUG-2001

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The information in this article applies to:

- Microsoft Windows NT Server version 4.0 
- Microsoft Windows NT Workstation version 4.0 
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SYMPTOMS
========

After you apply the security hotfix (Sec-fix) or Windows NT 4.0 Service Pack 3,
which includes this hotfix, applications that use null sessions may no longer
work properly.

For example, after you apply the security hotfix to a Windows NT computer running
Cheyenne ARCServe 6.0, you may receive the following error message when you
attempt to schedule a job (for example, local, remote, backup, and restore):

  User doesn't have enough rights to do this
  EC=5

CAUSE
=====

The updated security modules for Windows NT no longer permit null sessions to
access the Windows NT registry.

RESOLUTION
==========

Perform the following steps to resolve this problem:

WARNING: Using Registry Editor incorrectly can cause serious, system-wide
problems that may require you to reinstall Windows NT to correct them. Microsoft
cannot guarantee that any problems resulting from the use of Registry Editor can
be solved. Use this tool at your own risk.

1. Run Registry Editor (Regedt32.exe).

2. Go to the following key in the registry:

  HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\LanmanServer\Parameters\

3. Add "winreg" (without the quotation marks) to the NullSessionPipes entry.

4. Restart your computer.

MORE INFORMATION
================

For more information on the security hotfix (Sec-fix,) please see the following
article(s) in the Microsoft Knowledge Base:

  ARTICLE-ID: Q143474
  TITLE : Restricting Information Available to Anonymous Logon Users

  ARTICLE-ID: Q143475
  TITLE : Windows NT System Key Permits Strong Encryption of the SAM

  ARTICLE-ID: Q161372
  TITLE : How to Enable SMB Signing in Service Pack 3

This hotfix is also included with Windows NT 4.0 Service Pack 3.

Additional query words: prodnt AS
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Keywords          : kb3rdparty 
Technology        : kbWinNTsearch kbWinNTWsearch kbWinNTW400 kbWinNTW400search kbWinNT400search kbWinNTSsearch kbWinNTS400search kbWinNTS400
Version           : 4.0

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