DOCUMENT:Q171789  10-AUG-2001  [winnt]
TITLE   :PTR Record for DNS Server Is Not Automatically Created
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 
-------------------------------------------------------------------------------

SYMPTOMS
========

When you run Nslookup from a command prompt on your Microsoft Windows NT 4.0
Domain Name Service (DNS) server, you receive the following error message:

   **** Can't find server name for address x.x.x.x: Non-existent domain
   **** Default server is not available
   Default Server: UnKnown
   Address: x.x.x.x

Where x.x.x.x is the IP address of your DNS server.

NOTE: This problem may occur with other applications as well.

CAUSE
=====

There is a missing or mis-configured PTR record for your DNS server in your
reverse lookup zone. The DNS Manager does not automatically create a PTR record
for your DNS server, even though it may automatically create an "A" record in
your forward zone.

RESOLUTION
==========

To resolve this problem, perform the following steps:

1. From DNS Manager, open your forward zone.

2. Right-click on the "A" record for your DNS server, and then click Delete
   Record.

3. Click Yes to confirm the deletion of the "A" record.

4. Right-click on the forward zone, and then click New Host.

5. Type the host name of your DNS server and the IP address.

6. Select the Create Associated PTR Record check box.

7. Click Add Host, and then click Done.

If you receive an error when you click Add Host, then you may be having a problem
with your reverse lookup zone.

For additional information, please see the following articles in the Microsoft
Knowledge Base:

   Q166753 Microsoft DNS Server Reverse Lookup Error Adding Host Record

   Q162842 DNS with "WINS Reverse Lookup" Fails with Multiple IP Addresses

STATUS
======

Microsoft has confirmed this to be a problem in Windows NT version 4.0. We are
researching this problem and will post new information here in the Microsoft
Knowledge Base as it becomes available.

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

You can view the properties of an "A" record by right-clicking on it and then
clicking Properties. When the above problem is encountered, the "A" record
properties will have a check in Update Associated PTR Record. This seems to
indicate that the PTR record has been created and is active, however, it is not
true.

The reverse lookup zone is a database file that is used to allow a client, or
resolver, to provide an IP address and request a matching host name. This file
contains an SOA record and NS records similar to other DNS database zone files.
It also contains pointer records.

This DNS reverse lookup capability is important because some applications provide
these capabilities to implement security based on the connecting host names.
Nslookup is one of these utilities.

Additional query words:

======================================================================
Keywords          : kbnetwork 
Technology        : kbWinNTsearch 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.