DOCUMENT:Q216793  16-MAY-2002  [winnt]
TITLE   :DHCP Server Stops Leasing Addresses if Sharing Violation Occurs
PRODUCT :Microsoft Windows NT
PROD/VER:winnt:4.0
OPER/SYS:
KEYWORDS:kbWinNT4sp6fix

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The information in this article applies to:

 - Microsoft Windows NT Server version 4.0, Terminal Server Edition 
 - Microsoft Windows NT Server version 4.0 
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SYMPTOMS
========

The DHCP service stops responding to client lease and renewal requests. The
following errors are logged to the System and Application logs:

System Log
----------

Event ID 1014
Source DHCP Server
Description : The JET Database returned the following Error : -510
Data : 02 fe ff ff

Event ID 1016
Source DHCP Server Description : The DHCP Server encountered the following error
when backing up the user database :
Data : 2d 4e 00 00

Application Log 
---------------

Event ID 30
Source JET
Description : Unable to create log. The drive may be read-only or out of disk
space. Error - 1032

The error in the application log appears only once when the sharing violation
occurs. The errors in the system log are repeated every time the DHCP service
tries to backup it's database (default is every 15 minutes).

CAUSE
=====

The DHCP service uses a JET database to store configuration and lease
information. The service creates a backup copy of its database at a regular
interval. Any program or service other than the DHCP service gaining access to
the files in the DHCP directory may cause a sharing violation. As a result of
the sharing violation, the DHCP service stops processing all client requests
because it requires exclusive access to its database and log files.

RESOLUTION
==========

Windows NT Server or Workstation 4.0
------------------------------------

To resolve this problem, obtain the latest service pack for Windows NT 4.0 or the
individual software update. For information on obtaining the latest service
pack, please go to:

 - http://www.microsoft.com/Windows/ServicePacks/

-or-

 - Q152734 How to Obtain the Latest Windows NT 4.0 Service Pack

For information on obtaining the individual software update, contact Microsoft
Product Support Services. For a complete list of Microsoft Product Support
Services phone numbers and information on support costs, please go to the
following address on the World Wide Web:

   http://support.microsoft.com/default.aspx?scid=fh;EN-US;CNTACTMS


Windows NT Server 4.0, Terminal Server Edition
----------------------------------------------

To resolve this problem, obtain the latest service pack for Windows NT Server
4.0, Terminal Server Edition. For additional information, please see the
following article in the Microsoft Knowledge Base:

   Q152734 How to Obtain the Latest Windows NT 4.0 Service Pack


WORKAROUND
==========

The DHCP service should be the only process that gains access to the files in
the DHCP directory. In addition to applying the update described in this
article, the following procedural or configuration changes should be made.
If a backup of the Windows NT system files is required, the DHCP service should
be stopped until the backup is complete. If the system is running a virus
scanner, the directory containing the DHCP files should be omitted from those
being scanned (%systemroot%\system32\dhcp).

STATUS
======

Microsoft has confirmed this to be a problem in the Microsoft products that are
listed at the beginning of this article. This problem was first corrected in
Windows NT Server version 4.0, Terminal Server Edition Service Pack 6.


Additional query words:

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Keywords          : kbWinNT4sp6fix 
Technology        : kbWinNTsearch kbWinNT400search kbWinNTSsearch kbWinNTS400search kbWinNTS400 kbNTTermServ400 kbNTTermServSearch
Version           : winnt:4.0
Hardware          : ALPHA x86
Issue type        : kbbug
Solution Type     : kbfix

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