Microsoft KB Archive/187425

= TCP/IP Device Driver Does Not Remember Share Flags =

Article ID: 187425

Article Last Modified on 11/1/2006

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APPLIES TO


 * Microsoft Windows NT Server 4.0, Terminal Server Edition
 * Microsoft Windows NT Server 4.0 Standard Edition

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This article was previously published under Q187425



SYMPTOMS
TCP/IP device driver does not remember share flags of previous opened endpoints. Even if the previous endpoint is opened exclusively, another application can open the same endpoint with share flags and capture all network traffic.



CAUSE
When a port is opened for listening and share flags are specified, the driver grants access, even if the previous port was opened with exclusive rights (with share flags set to zero). The driver does not remember the shared flags of the previous call, and only checks the flags of the new one. The problem is in TCP/IP, and is applicable to all versions of Windows NT.



STATUS
Microsoft has confirmed this to be a bug in Windows NT Server 4.0, Terminal Server Edition.

Keywords: kbbug kbpending KB187425

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