Microsoft KB Archive/831423

= &quot;Instruction at '0x77f93245' Referenced Memory 0x000f1008&quot; Error Message When an RDP Client Logs Off of a Terminal Server =

Article ID: 831423

Article Last Modified on 10/26/2006

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APPLIES TO


 * Microsoft Windows 2000 Server
 * Microsoft Windows 2000 Advanced Server

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SYMPTOMS
When you use a remote desktop protocol (RDP) client to connect to a Microsoft Windows 2000-based Terminal Services computer, you may receive the following Dr. Watson error message when you log off the Terminal Services session:

The instruction at '0x77f93245' referenced memory 0x000f1008: The memory could not be read.

Additionally, after you receive this error message on the server, all Terminal Services client sessions are disconnected, and no new sessions can be established. Terminal Services clients receive the following error message:

Remote connections might not be enabled or the computer might be too busy to accept new connections. It is also possible that the network problems are preventing your connections.



CAUSE
This issue occurs if more than 1,640 users and groups are listed on the RDP-Tcp Properties Permissions tab in the Terminal Server Configuration Manager. When this condition is true, the security descriptor for the remote user is inadvertently released, because the maximum limit for the buffer that stores the access control entries (ACEs) has been exceeded.



Hotfix Information
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.

Prerequisites
No prerequisites are required.

Restart Requirement
You must restart your computer after you apply this hotfix.

Hotfix Replacement Information
This hotfix does not replace any other hotfixes.

File Information
The English version of this has the file attributes (or later) 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 ---  07-Nov-2003  18:00  5.0.2195.6871      27,920  Cfgbkend.dll 07-Nov-2003 17:54  5.0.2195.6871     142,608  Termsrv.exe 07-Nov-2003 18:01  5.0.2195.6824      39,184  Winsta.dll



STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the &quot;Applies to&quot; section of this article.



MORE INFORMATION
For additional information about how hotfix packages are named, click the following article number to view the article in the Microsoft Knowledge Base:

816915 New File Naming Schema for Microsoft Windows Software Update Packages

For additional information, click the following article number to view the article in the Microsoft Knowledge Base:

824684 Description of the Standard Terminology That Is Used to Describe Microsoft Software Updates

After you apply this hotfix, you receive the following error message if you add more than 1,350 users to the RDP-Tcp Properties Permissions tab in the Terminal Server Configuration Manager:

Unable to save permission changes on RDP-Tcp.

The inherited access control list (ACL) or access control entry (ACE) could not be built.



WORKAROUND
To work around this problem, create a local group on the terminal server, and then add the users or a global group to this local group. Then, add the local group to the RDP-Tcp Properties Permissions tab in the Terminal Server Configuration Manager.

Additional query words: client-server connect 0x77f93245 0x000f1008 memory could not be read

Keywords: kbhotfixserver kbqfe kberrmsg kbwinservperf kbtermserv kbbug kbfix kbqfe kbwin2000presp5fix KB831423

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