DOCUMENT:Q155701 TITLE :Invalid UDP Frames May Cause WINS to Terminate PRODUCT :Microsoft Windows NT PROD/VER:4.00 OPER/SYS:WINDOWS KEYWORDS:kbbug4.00 kbfile kbfix4.00 kbnetwork ntnetserv NTSrv nttcp -------------------------------------------------------------------------- The information in this article applies to: - Microsoft Windows NT Server version 4.0 -------------------------------------------------------------------------- SYMPTOMS ======== Invalid UDP frames directed to any computer running WINS raises an exception in WINS causing it to terminate silently. When WINS is no longer running, problems such as domain synchronization, browsing, or connectivity may occur. The event log may contain the following error message: Event ID: 4119 Source : WINS Type : Error Description: WINS got a packet that has the wrong format (for example, a label may be more than 63 octets). RESOLUTION ========== To resolve this problem, obtain the hotfix below, or wait for the next service pack. Microsoft has updated Wins.exe to correct this problem. If WINS receives invalid frames, it logs the event mentioned above but it does not terminate unexpectedly. NOTE: Service Pack 3 must be applied to Windows NT 4.0 prior to applying this fix. This hotfix has been posted to the following Internet location: ftp://ftp.microsoft.com/bussys/winnt/winnt-public/fixes/frn/NT40/ hotfixes-postSP3/winsupd-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 wins denial of service attack hangs port 137 ============================================================================ 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.