DOCUMENT:Q170862  15-MAR-2000  [iis]
TITLE   :Virtual Servers and HOST Name Resolution
PRODUCT :Internet Information Server
PROD/VER:winnt:3.0
OPER/SYS:
KEYWORDS:

======================================================================
-------------------------------------------------------------------------------
The information in this article applies to:

 - Microsoft Internet Information Server 3.0 
-------------------------------------------------------------------------------


SYMPTOMS
========

Internet Information Server (IIS) configured with multiple virtual servers can
cause problems with applications that are running on a computer that performs a
lookup of its own HOST name.

On a computer running Microsoft Windows NT Server with multiple IP addresses
assigned to the same network interface card, resolving the computer's HOST or
NetBIOS name will return the last IP address listed in the Network Control Panel
Advanced TCP/IP Properties, rather than the first address listed. All other
computers on the network that resolve this name will correctly get the first IP
address listed.

WORKAROUND
==========

If you are using DNS for name resolution, you can add an additional record for
the same computer with a different name. For example, if your computer name is
listed in DNS as WEBSERVER, you may also want to add an entry in DNS for WWW
that refers to the same IP address.

In this case, when you type "PING WWW," the name is not resolved locally, but
rather at the DNS server, and the correct IP address will be indicated in the
reply.


STATUS
======

Microsoft has confirmed this to be a problem in Microsoft 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


MORE INFORMATION
================

The following is an example of this configuration:

   HOST name = MACHINE1
   Assigned IP Addresses #1= 192.168.1.1
   Assigned IP Addresses #2= 192.168.1.2
   Assigned IP Addresses #3= 192.168.1.3

If you are at MACHINE1, and you type "PING MACHINE1," your reply will indicate
the 192.168.1.3 address.

If you are at another computer on the network, and you type "PING MACHINE1," your
reply will indicate the 192.168.1.1 address.

Additional query words: iis

======================================================================
Keywords          :  
Technology        : kbiisSearch kbiis300
Version           : winnt:3.0
Hardware          : ALPHA x86
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 2000.