DOCUMENT:Q192467 10-AUG-2001 [winnt] TITLE :Windows NT Load Balancing Service Remote Control Commands Fail PRODUCT :Microsoft Windows NT PROD/VER:winnt:1.0,4.0 OPER/SYS: KEYWORDS: ====================================================================== ------------------------------------------------------------------------------- The information in this article applies to: - Microsoft Windows NT Server version 4.0 - Microsoft Windows NT Server, Enterprise Edition version 4.0 - Microsoft Windows NT Load Balancing Service 1.0 ------------------------------------------------------------------------------- SYMPTOMS ======== When Windows NT Load Balancing Service (WLBS) remote control commands are invoked from a system outside the cluster, no response is received from one or more cluster hosts. CAUSE ===== This problem can be caused by one of the following: - The cluster network interface cards (NICs) are not reachable from the outside system. If you have multiple NICs on a cluster host, the dedicated NIC may be on a separate subnet from the cluster NIC. If you invoke a remote control command from an outside system on this subnet, the cluster NICs and WLBS driver will not receive the command. - Remote control commands are sent to a secondary cluster IP address. Commands must be sent to the cluster's primary IP address (which is entered in the WLBS Setup dialog box). - WLBS's UDP control port is blocked by a firewall. By default, remote control commands are sent to UDP port 1717 at the cluster IP address. You can also change the port number by modifying the corresponding WLBS registry parameter. RESOLUTION ========== To resolve this issue, use one of the following methods that correspond to the cause listed above: - Be sure that the cluster NICs on the cluster hosts can be reached by the outside system. -or- - Be sure that you send remote commands to the secondary cluster IP address. -or- - Be sure that UDP port 1717 has not been blocked by a router or firewall. MORE INFORMATION ================ The Windows NT Load Balancing Service is configurable from a remote location by copying the control program (WLBS.exe) to any Windows NT device. Additional query words: Convoy WLBS ====================================================================== Keywords : Technology : kbWinNTsearch kbWinNT400search kbWinNTSsearch kbWinNTSEntSearch kbWinNTSEnt400 kbWinNTS400search kbWinNTS400 kbWinNTLBS100 kbWinNTLBSSearch Version : winnt:1.0,4.0 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.