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Windows NT 4.0, Service Pack 6a is a collection of bug fixes, security updates and provides improved functionality and stability. It also fixes bugs that were added from previous service packs (including SP6), addresses known Y2K issues - including those released after SP5 - and adds Euro currency support. Service Pack 6|SP6 can be applied to Windows NT 4.0 Workstation, Server, and Enterprise Server versions.

Special note: the difference between SP6 and SP6a is simply a small bug fix. The problem appeared when a program attempted to connect to a server and the user did not have full administrative rights to the computer. You may have seen an application error such as:

  • Could Not Connect to Server
  • Access Denied

Windows NT 4.0 SP6 was out for only a few weeks in November 1999, and very few people were affected by the bug, which is fixed in SP6a.


Windows NT 4.0 Service Pack List
Windows NT 4.0 Service Pack List: SP1 | SP2 | SP3 | SP4 | SP5 | SP6 | SP6a

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