DOCUMENT:Q193598 10-AUG-2001 [winnt] TITLE :IP Conflict After Installing Windows NT Load Balancing Service PRODUCT :Microsoft Windows NT PROD/VER:winnt:4.0 OPER/SYS: KEYWORDS:kbnetwork ====================================================================== ------------------------------------------------------------------------------- The information in this article applies to: - Microsoft Windows NT Server version 4.0 - Microsoft Windows NT Load Balancing Service ------------------------------------------------------------------------------- SYMPTOMS ======== After installing Windows NT Load Balancing Service (WLBS) and restarting a cluster host, the following Windows NT system error is received: The system has detected an IP address conflict with another system on the network. CAUSE ===== Probable causes are as follows: 1. Two different cluster primary IP addresses were entered in the TCP/IP configuration in the Windows NT Network dialog box on different hosts. 2. Two different cluster network addresses were entered in the WLBS Setup dialog box on different hosts. 3. One or more of the cluster network interface cards (NICs) could not change its network address. This problem only occurs when using a unicast network address (instead of a multicast address). RESOLUTION ========== To resolve these issues, use the corresponding resolutions below: 1. Be sure to use one primary cluster IP address for all cluster hosts. 2. Be sure to use one cluster network address for all cluster hosts. 3. You should either switch to a different type of NIC or use WLBS's multicast support. Additional query words: Convoy WLBS ====================================================================== Keywords : kbnetwork Technology : kbWinNTsearch kbWinNT400search kbWinNTSsearch kbWinNTS400search kbWinNTS400 kbWinNTLBSSearch Version : winnt:4.0 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 2001.