Microsoft KB Archive/249135

= Cannot Apply 56-Bit Service Pack 6/6a to 128-Bit Version of Windows NT 4.0 =

Article ID: 249135

Article Last Modified on 11/1/2006

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APPLIES TO


 * Microsoft Windows NT Server 4.0 Standard Edition
 * Microsoft Windows NT Workstation 4.0 Developer Edition
 * Microsoft Windows NT Server 4.0 Enterprise Edition

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This article was previously published under Q249135



SUMMARY
You cannot apply the 56-bit (standard encryption) version of Service Pack 6 or 6a to a version of Windows NT 4.0 that is running a 128-bit (high encryption) version of a service pack.



MORE INFORMATION
If you attempt to apply the 56-bit (standard encryption) version of Service Pack 6 or 6a to a version of Windows NT 4.0 that is running a 128-bit (high encryption) version of a service pack, you receive the following error message:

You have chosen to install a version of the Service Pack with Standard Encryption onto a system with High Encryption. This is not supported. To successfully install this version of the Service Pack, you must install the High Encryption version. Press help for more information about obtaining the High Encryption version of this Service Pack. Service Pack setup will now exit.

In earlier service packs, installing a lower-encryption service pack generates an error message stating that you are about to downgrade the level of security, but you can install standard encryption over high encryption. In Service Pack 6/6a, you cannot do so.

For additional information, click the article number below to view the article in the Microsoft Knowledge Base:

250867 Cannot Install Service Pack 6/6a with High Encryption Internet Explorer

Keywords: kberrmsg kbinfo KB249135

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