Terminal Services Sessions Are Disconnected Because of a Decryption Error (311371)

The information in this article applies to:

Microsoft Windows 2000 Server SP1
Microsoft Windows 2000 Server SP2
Microsoft Windows 2000 Advanced Server SP1
Microsoft Windows 2000 Advanced Server SP2

This article was previously published under Q311371

SYMPTOMS

If you are running Windows 2000 as a Terminal Services server and the client sessions are encrypted, clients may intermittently lose their connection. When this occurs, entries similar to the following entry are recorded in the System event log:

Event Type: Error
Event Source: TermDD
Event Category: None
Event ID: 50
Date: 10.05.2001
Time: 10:33:10
User: N/A
Computer: Computer
Description:
The RDP protocol component "DATA ENCRYPTION" detected an error in the protocol stream and has disconnected the client.

CAUSE

In a low-bandwidth network with fragmented IP frames, encrypted frames that are sent by a client may not be decrypted correctly.

RESOLUTION

To resolve this problem, obtain the latest service pack for Windows 2000. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:

260910 How to Obtain the Latest Windows 2000 Service Pack

The English version of this fix should have the following file attributes or later:

   Date         Time   Version        Size     File name
   --------------------------------------------------------
   28-Oct-2001  23:39  5.0.2195.4557  129,296  Instrdp5.dll
   28-Oct-2001  23:39  5.0.2195.4557  111,496  Rdpwd.sys

STATUS

Microsoft has confirmed that this is a problem in the Microsoft products that are listed at the beginning of this article. This problem was first corrected in Windows 2000 Service Pack 3.

MORE INFORMATION

For additional information about how to obtain a hotfix for Windows 2000 Datacenter Server, click the article number below to view the article in the Microsoft Knowledge Base:

265173 The Datacenter Program and Windows 2000 Datacenter Server Product

For additional information about how to install multiple hotfixes with only one reboot, click the article number below to view the article in the Microsoft Knowledge Base:

296861 Use QChain.exe to Install Multiple Hotfixes with One Reboot

Modification Type:	Minor	Last Reviewed:	9/26/2005
Keywords:	kbHotfixServer kbQFE kbbug kbfix kbSecurity kbTermServ kbWin2000PreSP3Fix kbWin2000sp3fix KB311371