DOCUMENT:Q161372    [winnt]
TITLE   :How to Enable SMB Signing 
PRODUCT :Microsoft Windows NT
PROD/VER:4.00
OPER/SYS:WINDOWS
KEYWORDS:kbenv kbnetwork ntenv NTSrvWkst
	
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The information in this article applies to:

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

This article explains how to enable SMB signing.


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

There is now available an updated version of the Server Message Block
(SMB) authentication protocol, also known as the Common Internet File
System (CIFS) file sharing protocol.

Perform the following steps to configure SMB signing on a server:

Install the security update from:

ftp://ftp.microsoft.com/bussys/winnt-public/fixes/usa/nt4/hotfixes-postSP2/
sec-fix/

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

1. Run Registry Editor (Regedt32.exe).

2. From the HKEY_LOCAL_MACHINE subtree, go to the following key:

      System\CurrentControlSet\Services\LanManServer\Parameters

3. Click Add Value on the Edit menu.

4. Add the following two values:

      Value Name: EnableSecuritySignature
      Data Type: REG_DWORD
      Data: 0 (disable), 1 (enable)

         NOTE: The default is 0 (disable)

      Name: RequireSecuritySignature
      Type: REG_DWORD
      Value: 0 (disable), 1 (enable)

         NOTE: The default is 0 (disable)

5. Click OK and then quit Registry Editor.

6. Shut down and restart Windows NT.

Perform the following steps to configure SMB signing on a workstation:

1. Run Registry Editor (Regedt32.exe).

2. From the HKEY_LOCAL_MACHINE subtree, go to the following key:

      \System\CurrentControlSet\Services\Rdr\Parameters

3. Click Add Value on the Edit menu.

4. Add the following two values:

      Value Name: EnableSecuritySignature
      Data Type: REG_DWORD
      Data: 0 (disable), 1 (enable)

         NOTE: The default is 1 (enable)

      Name: RequireSecuritySignature
      Type: REG_DWORD
      Value: 0 (disable), 1 (enable)

         NOTE: The default is 0 (disable)

5. Click OK and then quit Registry Editor.

6. Shut down and restart Windows NT.

KBCategory: kbenv
KBSubcategory: NTSrvWkst ntprotocol 
Additional reference words: prodnt 4.00

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