Windows NT 4.0 Service Pack 6a : [Microsoft Windows NT Server 4.0; Service Pack 6a; SP6a]

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Windows NT 4.0 Service Pack 6a

Windows NT® 4.0 Service Pack 6a (SP6a) resolves the SP6 issue with Lotus Notes and other Winsock based applications and provides the latest updates to Microsoft® Windows NT® Workstation 4.0 and Windows NT Server 4.0 (including Enterprise Edition). Windows NT 4.0 SP6a contains known Year 2000 updates for Windows NT 4.0. These Year 2000 updates are also available as separate Web downloads that you can apply to a Windows NT 4.0 Service Pack 4 system. Providing these options gives organizations the flexibility to choose which path is easier for them to address Year 2000 issues. Windows NT 4.0 SP6a is not a required upgrade for Year 2000; Microsoft recommends that each customer consult the Windows NT 4.0 SP6a documentation and then determine whether to deploy it.

Note The Post-SP6a Security Rollup Package (SRP) is now available, and provides all security updates released for Windows NT 4.0 since the release of Windows NT 4.0 Service Pack 6a. You can only install the Security Rollup Package if you are running Windows NT 4.0 Service Pack 6a.

Windows NT 4.0 SP6a includes the following updates to SP6:

The update for the SP6 issue with Lotus Notes and other Winsock based applications. This issue prevents connection to the server when the current user is not logged in with administrator rights. For more information about this issue, read Microsoft Knowledge Base (KB) Article Q245678
In accordance with Microsoft's commitment to Year 2000 compliance, SP6a includes an update to the IIS 3.0 log converter utility, convlog. For more information about this, read Microsoft Knowledge Base (KB) Article Q245329.
Winver.exe has been revised to allow you to quickly verify whether a system is running Windows NT 4.0 SP6a.

If you installed SP6 or SP6a between November 22 and November 29, 1999, please confirm which service pack you have by following these steps. This is recommended because part of the SP6a pages were mistakenly pushed to the web before the SP6a binaries were released. If you already have SP6a installed, you do not need to take any action.

If you have SP6 installed, you can update your computer by installing the corresponding X86 or Alpha SP6a hotfix.

Important: To avoid problems, including possible data loss, if you use both Microsoft Outlook and Computer Associates Inoculan, you should verify that you are using the latest version of the Inoculan drivers before installing Windows NT 4.0 SP6a. Please visit http://support.ca.com to obtain the latest drivers. Other applications and prior versions of Service Packs may be affected as well; see the Microsoft Knowledge Base article Q244652 for additional details.

SP6a is available in Standard Encryption or High Encryption (128-bit) versions for both the Intel x86 and DEC Alpha platforms. Both versions contain the same updates and differ only in the level of encryption. The Standard Encryption versions below allow you to choose a language for SP6a and select a specific downloading site.

Note: If you have previously installed 128-bit components on your system, download the High Encryption version.

Choose a download version:

Standard Encryption version for the Intel (x86) platform
Available to all customers, this version provides standard encryption capabilities for computers running on the Intel (x86) platform.
Standard Encryption version for the DEC Alpha platform
Available to all customers, this version provides standard encryption capabilities for computers running on the DEC Alpha platform.
High Encryption version for the Intel (x86) platform
This version provides 128-bit encryption capabilities for computers running on the Intel (x86) platform. The High Encryption version of Windows NT 4.0 SP6a is eligible for export from the U.S. to all customers worldwide, except to U.S. embargoed destinations. Information on exporting Microsoft products is available at http://www.microsoft.com/exporting/.
High Encryption version for the DEC Alpha platform
This version provides 128-bit encryption capabilities for computers running on the DEC Alpha platform. The High Encryption version of Windows NT 4.0 SP6a is eligible for export from the U.S. to all customers worldwide, except to U.S. embargoed destinations. Information on exporting Microsoft products is available at http://www.microsoft.com/exporting/.

Learn More

System Requirements
Check system requirements for Windows NT 4.0 SP6a.
Readme File
See the Readme file for documentation about Windows NT 4.0 SP6a including installation instructions and known issues.
Updates Catalog Part 1 Q241211
Updates Catalog Part 2 Q244690
View the list of fixes in Windows NT 4.0SP6a. (SP6a includes all updates provided in SP6.)
Frequently Asked Questions (FAQ)
Get answers to questions about SP6a.
Security Updates
Visit Microsoft's Security Advisor Web site for the latest security bulletins.
Market Bulletin
Read the market bulletin for Windows NT 4.0 SP6a.
Windows NT 4.0 SP6a Debug Symbols
Download Debug Symbol files for use in diagnosing application and computer crashes. Recommended for system administrators and other advanced users, Debug Symbol files are not required for proper operation of your computer.
Windows NT 4.0 SP6a Checked Build
Download Checked Build files for use in diagnosing application and computer crashes. Recommended for system administrators and other advanced users, Checked Build files are not required for proper operation of your computer.
Setupdd.sys
Download hotfix installer and instructions (for both alpha and i386 versions). Recommended (sometimes required) for distributing Windows NT 4.0 SP6a in a network environment.