DOCUMENT:Q253821 06-AUG-2002 [winnt] TITLE :System Error 85 with "NET USE" Command PRODUCT :Microsoft Windows NT PROD/VER:winnt:4.0,4.0 SP4,4.0 SP5 OPER/SYS: KEYWORDS:kbenv kberrmsg ====================================================================== ------------------------------------------------------------------------------- The information in this article applies to: - Microsoft Windows NT Server versions 4.0, 4.0 SP4, 4.0 SP5, 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 a non-administrative user attempts to reconnect to a shared network drive that the user has already used, system error 85 ("Local device name already in use") may be generated. For example, running the following sequence of commands in a logon script or from a command prompt illustrates the issue: net use r: /d net use r: \\\ net use r: /d net use r: \\\ The behavior does not occur for users with administrative privileges. CAUSE ===== This behavior is caused by a setting of 1 in the following registry value: HKLM\System\CurrentControlSet\Control\SessionManager\ProtectionMode If the setting is 1, the problem occurs. If you change the setting to 0 and reboot the server, the problem disappears. Note that the following articles in the Microsoft Knowledge Base suggest changing this value to 1 to restrict changes to Base System objects and for solving problems with symbolic links: Q218473 Restricting Changes to Base System Objects Q244995 Base System Object Restrictions Are Not Enabled by Default Q222159 Symbolic Link Case Sensitivity Exploit Bypasses System Security WORKAROUND ========== 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. Change the entry for HKLM\System\CurrentControlSet\Control\SessionManager\ProtectionMode from 1 to 0. Additional query words: ====================================================================== Keywords : kbenv kberrmsg Technology : kbWinNTsearch kbWinNT400search kbWinNTSsearch kbWinNTS400search kbNTTermServ400 kbNTTermServ400sp4 kbNTTermServ400sp5 kbNTTermServSearch Version : winnt:4.0,4.0 SP4,4.0 SP5 Issue type : kbprb ============================================================================= 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.