DOCUMENT:Q161038 09-AUG-2001 [winnt] TITLE :Winsock Apps Fail on First Attempt at NetBIOS Name Resolution PRODUCT :Microsoft Windows NT PROD/VER:winnt:4.0 OPER/SYS: KEYWORDS:kbnetwork kbAPI kbSDKPlatform kbWinsock kbGrpDSNetkbbuglist kbfixlist ====================================================================== ------------------------------------------------------------------------------- The information in this article applies to: - Microsoft Windows NT Workstation version 4.0 - Microsoft Windows NT Server version 4.0 ------------------------------------------------------------------------------- SYMPTOMS ======== After applying Service Pack 2 to Windows NT 4.0, socket applications fail to complete connections on the first attempt. Simply retrying the connection works. This problem has been seen with Internet Explorer, as well as with FTP applications. CAUSE ===== When an attempt is made to resolve a NetBIOS name, the request goes out on all interfaces, including RAS. RAS completes right away, indicating timeout, and Registration and Name Resolution (RNR) cancels all outstanding requests. Instead, RNR needs to wait for all outstanding requests to complete. The only time you will see this problem is when you are using a winsock app on a computer attempting to connect to a server on a remote network, with no DNS servers configured, RAS installed, and NETBT node type set as M- node. You will see the problem only on the first try, and subsequent attempts to resolve the name will work. WORKAROUND ========== The following are workarounds for this problem: - Configure a Domain Name Service (DNS) server. -or- - Change the NetBT node type to anything other than M-Node. -or- - Remove RAS. STATUS ====== Microsoft has confirmed this to be a problem in Windows NT version 4.0. This problem was corrected in the latest Microsoft Windows NT 4.0 U.S. Service Pack. For information on obtaining the service pack, query on the following word in the Microsoft Knowledge Base (without the spaces): S E R V P A C K Additional query words: prodnt SP2 ====================================================================== Keywords : kbnetwork kbAPI kbSDKPlatform kbWinsock kbGrpDSNet kbbuglist kbfixlist Technology : kbWinNTsearch kbWinNTWsearch kbWinNTW400 kbWinNTW400search kbWinNT400search kbWinNTSsearch kbWinNTS400search kbWinNTS400 Version : winnt:4.0 Issue type : kbbug ============================================================================= 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 2001.