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 ====================================================================== ------------------------------------------------------------------------------- The information in this article applies to: - Microsoft Windows NT Server version 4.0, Terminal Server Edition - Microsoft Windows NT Server version 4.0 ------------------------------------------------------------------------------- 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: ====================================================================== Keywords : kbWinNT4sp6fix Technology : kbWinNTsearch kbWinNT400search kbWinNTSsearch kbWinNTS400search kbWinNTS400 kbNTTermServ400 kbNTTermServSearch Version : winnt:4.0 Hardware : ALPHA x86 Issue type : kbbug Solution Type : kbfix ============================================================================= 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 2002.