DOCUMENT:Q162927 [winnt] TITLE :Telnetting to Port 53 May Crash DNS Service PRODUCT :Microsoft Windows NT PROD/VER:4.00 OPER/SYS:WINDOWS KEYWORDS:kbnetwork kbbug4.00 kbfile -------------------------------------------------------------------------- The information in this article applies to: - Microsoft Windows NT Server version 4.0 -------------------------------------------------------------------------- SYMPTOMS ======== A Windows NT 4.0 DNS server produces the following event error 454: DNS Server select() Function failed. The data is the error. Besides the event error, CPU usage is high, the DNS server is unstable, and it sometimes crashes. CAUSE ===== The possible cause of this problem is when an unknown user telnets to the DNS server port 53. When this is done, and a few characters are typed, the above behavior is seen on the Windows NT 4.0 DNS server. 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-postSP2/dns-fix STATUS ====== Microsoft has confirmed this to be a problem in Windows NT version 4.0. A supported fix is now available, but is not 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. KBCategory: kbnetwork kbbug4.00 kbfile KBSubcategory: nttcp NTSrv Additional reference words: dns 4.00 prodnt ============================================================================ 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 1996.