Update to Windows for Workgroups TCP/IP for Out-of-Band Issue

 Last reviewed: August 29, 1997
Article ID: Q173241
The information in this article applies to:
  • Microsoft TCP/IP-32 version 3.11b for Windows for Workgroups
  • Microsoft Windows for Workgroups version 3.11

SYMPTOMS

Windows for Workgroups version 3.11 users with Microsoft TCP/IP installed and running may be susceptible to very specific "out-of-band" data packets that are deliberately sent to the server during a TCP/IP session.

When they are received, these packets may cause the Windows for Workgroups 3.11-based computer to stop responding (hang).

CAUSE

This problem can occur if certain very specific "out-of-band" data packets are deliberately sent to the server during a TCP/IP session.

STATUS

Microsoft has confirmed this to be a problem in Microsoft Windows for Workgroups 3.11 running Microsoft TCP/IP 32b. An update to address this problem is now available, but is not fully regression tested and should be applied only to computers experiencing this specific problem. Unless you are severely impacted by this specific problem, Microsoft does not recommend implementing this update at this time. Contact Microsoft Technical Support for additional information about the availability of this update.

MORE INFORMATION

For additional information about out-of-band data issues, see the following articles in the Microsoft Knowledge Base: 

   ARTICLE-ID: Q96682
   TITLE     : Out-of-Band Data and Push Bit in TCP/IP

   ARTICLE-ID: Q168747
   TITLE     : Update to Windows 95 TCP/IP to Address Out-of-Band Issue

   ARTICLE-ID: Q143478
   TITLE     : Stop 0A in TCPIP.SYS When Receiving Out Of Band (OOB)
               Data

Additional query words: attack oob
Keywords : wfwg kbnetwork kbtool kbfixlist
Version : 3.11 3.11b
Platform : WINDOWS

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Last reviewed: August 29, 1997
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