DOCUMENT:Q198386 11-JUN-2002 [winnt] TITLE :Changes in IRP Stack Size in Lanman Server PRODUCT :Microsoft Windows NT PROD/VER::4.0 OPER/SYS: KEYWORDS:kbWinNT400sp4fix ====================================================================== ------------------------------------------------------------------------------- The information in this article applies to: - Microsoft Windows NT Server version 4.0 - Microsoft Windows NT Server version 4.0, Terminal Server Edition ------------------------------------------------------------------------------- IMPORTANT: This article contains information about modifying the registry. Before you modify the registry, make sure to back it up and make sure that you understand how to restore the registry if a problem occurs. For information about how to back up, restore, and edit the registry, click the following article number to view the article in the Microsoft Knowledge Base: Q256986 Description of the Microsoft Windows Registry SYMPTOMS ======== When you access shares on a computer running Windows NT Server from a Windows NT client and the IRPstackSize parameter is set too low on the server, you may receive the following error message: Not enough server storage is available to process this command. CAUSE ===== Depending on the hardware configuration of a specific computer, the default value may not be large enough for the Srv service to properly administer shared directories on some of the physical drives. You may see one or both of the following event messages: Event ID: 2011 Source: Srv The server's configuration parameter "irpstacksize" is too small for the server to use a local device. Please increase the value of this parameter. Event ID: 0 Source SRV Description: Description for Event ID 0 could not be found. It contains the insertion string \device\LanManServer You may receive one of the above error message when a Windows NT client tries to access certain shared directories on such a server. When a Windows for Workgroups client tries to access the same shared directories, the following message will be generated: Path not found. RESOLUTION ========== To resolve this problem, obtain the latest service pack for Windows NT 4.0 or Windows NT Server 4.0, Terminal Server Edition 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 Service Pack (SP) 5 sets a minimum allowed of 7. It ignores all smaller values, and sets a default of 7 if none is specified. SP6 sets a minimum allowed of 7. It ignores all smaller values and sets a default of 11 if none is specified. WORKAROUND ========== To work around this problem, modify the registry by using the following information. WARNING: If you use Registry Editor incorrectly, you may cause serious problems that may require you to reinstall your operating system. Microsoft cannot guarantee that you can solve problems that result from using Registry Editor incorrectly. Use Registry Editor at your own risk. The registry value IRPstackSize, which may be listed at HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\LanmanServer \Parameters defaults to 0x4 if the value is not explicitly present. Valid values range from 0x1 to 0xC (1 to 12). To increase the value of the parameter when it is not already present, go to the key: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services \LanmanServer\Parameters NOTE: The above registry key is one path; it has been wrapped for readability. For the IRPStackSize change to take effect, the Server has to be rebooted. The value of IRPStackSize defaults to 0x4 if it is not explicitly present. If the key is not present, click Add Value in Registry Editor. The Value Name should be IRPStackSize and the Data Type is REG_DWORD. STATUS ====== Microsoft has confirmed this to be a problem in Windows NT 4.0 and Windows NT Server 4.0, Terminal Server Edition. This problem was first corrected in Windows NT 4.0 Service Pack 4.0 and Windows NT Server 4.0, Terminal Server Edition Service Pack 4. Additional query words: ====================================================================== Keywords : kbWinNT400sp4fix Technology : kbWinNTsearch kbWinNT400search kbWinNTSsearch kbWinNTS400search kbWinNTS400 kbNTTermServ400 kbNTTermServSearch Version : :4.0 Issue type : kbprb 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.