Problems when more than one user accesses the same file through Terminal Services (818528)

Important This article contains information about how to modify the registry. Make sure to back up the registry before you modify it. Make sure that you know how to restore the registry if a problem occurs. For more information about how to back up, restore, and modify the registry, click the following article number to view the article in the Microsoft Knowledge Base:

256986 Description of the Microsoft Windows registry

SYMPTOMS

In a Windows 2000 Terminal Services environment, users who access the same file over the network or over mapped network drives may experience problems after the first user who opened the file closes it. These problems were documented in the following KB articles:

294816 Programs that are run from a network share on Terminal Services close or generate errors

299603 You receive an "Error reading file" error message in Windows 2000 Terminal Services

CAUSE

The Windows 2000 network redirector maintains the data structures per computer, and therefore if two users on the same terminal server access the same file over the network, they share the same data structures internally. When the first user closes the file, the redirector also closes the file for other users.

RESOLUTION

A supported hotfix is now available from Microsoft, but it is only intended to correct the problem that this article describes. Apply it only to systems that are experiencing this specific problem.

To resolve this problem, contact Microsoft Product Support Services to obtain the hotfix. For a complete list of Microsoft Product Support Services telephone numbers and information about support costs, visit the following Microsoft Web site:

http://support.microsoft.com/contactus/?ws=support

Note In special cases, charges that are ordinarily incurred for support calls may be canceled if a Microsoft Support Professional determines that a specific update will resolve your problem. The usual support costs will apply to additional support questions and issues that do not qualify for the specific update in question.

The English version of this hotfix has the file attributes (or later file attributes) that are listed in the following table. The dates and times for these files are listed in Coordinated Universal Time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time tool in Control Panel.

   Date         Time    Version       Size     File name
   ------------------------------------------------------
   04-Jun-2003  17:18  5.0.2195.6752  407,792  Mrxsmb.sys
   04-Jun-2003  17:18  5.0.2195.6752  168,496  Rdbss.sys

MORE INFORMATION

Warning Serious problems might occur if you modify the registry incorrectly by using Registry Editor or by using another method. These problems might require that you reinstall your operating system. Microsoft cannot guarantee that these problems can be solved. Modify the registry at your own risk. For more information about how to obtain a hotfix for Windows 2000 Datacenter Server, click the following article number to view the article in the Microsoft Knowledge Base:

265173 The Datacenter Program and Windows 2000 Datacenter Server Product

To use the new functionality of this fix and to use per user data structures, you must add the following registry entry on the terminal server.

Subkey: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MRxSmb\Parameters
Type: REG_DWORD
Entry: MultiUserEnabled
Value: 1