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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:
(https://support.microsoft.com/kb/256986/EN-US/ )Description of the Microsoft Windows Registry
If a disconnected session has an active "Hard Error" dialog box that is generated by a DOS or 16-bit program, it cannot be reset. If a reset is attempted on the workstation, it stays in a "down" state until the computer is restarted.
To resolve this problem, obtain the latest service pack for Windows NT Server 4.0, Terminal Server Edition. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:
(https://support.microsoft.com/kb/152734/EN-US/ )How to Obtain the Latest Windows NT 4.0 Service Pack
To work around this problem, you can disable dialog boxes from ever being displayed. This is done with a registry setting. For additional information, see the following article or articles in the Microsoft Knowledge Base:
124873WARNING: 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.
(https://support.microsoft.com/kb/124873/EN-US/ )Disabling System Hard Error Message Dialog Boxes
Microsoft has confirmed that this is a problem in Windows NT Server 4.0, Terminal Server Edition. This problem was first corrected in Windows NT 4.0 Service Pack 5.