DOCUMENT:Q173241 08-MAY-2002 [crossnet] TITLE :Update to Windows for Workgroups TCP/IP for Out-of-Band Issue PRODUCT :Windows for Workgroups and Windows NT Networking Issues PROD/VER::3.11b OPER/SYS: KEYWORDS:kbnetwork kbtoolkbfixlist ====================================================================== ------------------------------------------------------------------------------- The information in this article applies to: - Microsoft TCP/IP-32 for Windows for Workgroups, version 3.11b - Microsoft Windows for Workgroups ------------------------------------------------------------------------------- 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. RESOLUTION ========== Microsoft has confirmed this to be a problem in Microsoft Windows for Workgroups 3.11 running Microsoft TCP/IP 32b. A supported fix is now available from Microsoft, but it is only intended to correct the problem described in this article and should be applied only to systems experiencing this specific problem. To resolve this problem, contact Microsoft Product Support Services to obtain the fix. For a complete list of Microsoft Product Support Services phone numbers and information on support costs, please go to the following address on the World Wide Web: http://support.microsoft.com/default.aspx?scid=fh;EN-US;CNTACTMS NOTE: In special cases, charges that are normally incurred for support calls may be canceled, if a Microsoft Support Professional determines that a specific update will resolve your problem. Normal support costs will apply to additional support questions and issues that do not qualify for the specific update in question. MORE INFORMATION ================ For additional information about out-of-band data issues, see the following articles in the Microsoft Knowledge Base: Q168747 Update to Windows 95 TCP/IP to Address Out-of-Band Issue Q143478 Stop 0A in TCPIP.SYS When Receiving Out Of Band (OOB) Data Additional query words: attack ====================================================================== Keywords : kbnetwork kbtool kbfixlist Technology : kbAudDeveloper kbTCPIPSearch kbWFWSearch kbZNotKeyword3 kbTCPIP311b Version : :3.11b Issue type : kbprb ============================================================================= THE INFORMATION PROVIDED IN THE MICROSOFT KNOWLEDGE BASE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. MICROSOFT DISCLAIMS ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL MICROSOFT CORPORATION OR ITS SUPPLIERS BE LIABLE FOR ANY DAMAGES WHATSOEVER INCLUDING DIRECT, INDIRECT, INCIDENTAL, CONSEQUENTIAL, LOSS OF BUSINESS PROFITS OR SPECIAL DAMAGES, EVEN IF MICROSOFT CORPORATION OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. SOME STATES DO NOT ALLOW THE EXCLUSION OR LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES SO THE FOREGOING LIMITATION MAY NOT APPLY. Copyright Microsoft Corporation 2002.