After you apply Windows NT 4.0 Service Pack 6, Winsock calls may not work properly. Generally the problem manifests itself when a program attempts to connect to a server. You may see an application layer error like:

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The problem only occurs if the user does not have full administrative rights to the computer.

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Windows NT 4 Service Pack 6a has been released to fix this problem. A hotfix is available to update SP6 systems to SP6a. For more information, please click the article link below to view the article in the Microsoft Knowledge Base: For more information about how to download Microsoft support files, click the following article number to view the article in the Microsoft Knowledge Base: Microsoft scanned this file for viruses. Microsoft used the most current virus-detection software that was available on the date that the file was posted. The file is stored on security-enhanced servers that help prevent any unauthorized changes to the file. The English-language version of this fix should have the following file attributes or later:

   Date        Time     Size       File name   Platform
   -----------------------------------------------------
   11/11/1999  05:18p    66,352    Afd.sys     x86
   11/11/1999  05:23p   115,184    Afd.sys     Alpha
				

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Microsoft has confirmed that this is a problem in Windows NT 4.0 Service Pack 6.

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