Bad Network Packet May Cause Access Violation (AV) on DNS Server

 Last reviewed: June 9, 1997
Article ID: Q142047
The information in this article applies to:
  • Microsoft Windows NT Server version 4.0

SYMPTOMS

The Domain Name System (DNS) fails with an access violation and ceases to resolve names.

CAUSE

If a DNS query is modified so that the original query's AnswerCount field is greater than 0, the DNS server may cause an access violation (AV).

If the AnswerCount is greater than 0, we expect to already have data from the original query, but in this case, the data is not present.

RESOLUTION

Obtain the following fix, or wait for the next Windows NT service pack.

This hotfix has been posted to the following Internet location: 

   ftp://ftp.microsoft.com/bussys/winnt/winnt-public/fixes/usa/NT40/
   hotfixes-postSP3/dns-fix

STATUS

Microsoft has confirmed this to be a problem in Windows NT version 4.0. A supported fix is now available, but has not been fully regression-tested and should be applied only to systems experiencing this specific problem. Unless you are severely impacted by this specific problem, Microsoft recommends that you wait for the next Service Pack that contains this fix. Contact Microsoft Technical Support for more information.

Additional query words: 4.00 prodnt
Keywords : kbbug4.00 kbnetwork NTSrv nttcp
Version : 4.0
Platform : WinNT
Issue type : kbbug
Resolution Type : kbfix

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Last reviewed: June 9, 1997
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