128-Bit Encryption Upgrade May Not Work with Service Pack 4

ID: Q216270

The information in this article applies to:

SYMPTOMS

When you upgrade to 128-bit encryption for Internet Explorer on a Windows NT 4.0-based computer with Service Pack 4, the upgrade may not provide 128-bit security.


CAUSE

This behavior occurs because the files that are installed by the 128-bit security update are older than the Service Pack 4 security files already on your computer.


RESOLUTION

To resolve this issue, install Windows NT 4.0 Service Pack 4, 128-Bit North American Version. This is available at the following Microsoft Web site:

http://support.microsoft.com/support/ntserver/content/servicepacks/sp4.asp


MORE INFORMATION

For more information about 128-bit encryption, see the following articles in the Microsoft Knowledge Base:

Q195833 How to Upgrade Internet Explorer to 128-Bit Encryption
Q176820 Differences Between 128-bit and 40-bit versions of SP3 and SP4

Additional query words: 


Keywords          : ntsecurity msient 
Version           : WINDOWS:4.0,4.01
Platform          : WINDOWS 
Issue type        : kbprb

Last Reviewed: July 6, 1999