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Q192467: Windows NT Load Balancing Service Remote Control Commands Fail

Article: Q192467
Product(s): Microsoft Windows NT
Version(s): winnt:1.0,4.0
Operating System(s): 
Keyword(s): 
Last Modified: 10-AUG-2001

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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 
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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

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Keywords          :  
Technology        : kbWinNTsearch kbWinNT400search kbWinNTSsearch kbWinNTSEntSearch kbWinNTSEnt400 kbWinNTS400search kbWinNTS400 kbWinNTLBS100 kbWinNTLBSSearch
Version           : winnt:1.0,4.0
Issue type        : kbprb

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