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Windows 2000 Telnet Server Stops Responding After Binary Input

The information in this article applies to:
  • Microsoft Windows 2000 Professional
  • Microsoft Windows 2000 Server
  • Microsoft Windows 2000 Advanced Server


When a Windows 2000-based computer that is running the Telnet Server service receives a malformed stream of binary zeros as input from a Telnet client, the Telnet Server service may stop responding (hang).


A supported fix that corrects this problem is now available from Microsoft, but it has not been fully regression tested and should be applied only to computers that are experiencing this specific problem. If you are not severely affected by this specific problem, Microsoft recommends that you wait for the next Windows 2000 service pack that contains this fix.

To resolve this problem immediately, contact Microsoft Product Support Services to obtain the fix. For a complete list of Microsoft Product Support Services phone numbers and information about support costs, please go to the following address on the World Wide Web:
The English version of this fix should have the following file attributes or later:
   Date       Time     Size      File name
   06/30/00   04:03p    55,056   Tlntsess.exe
   06/30/00   04:03p   180,496   Tlntsvr.exe 


Microsoft has confirmed this to be a problem in the Microsoft products listed at the beginning of this article.


When the Telnet Server service hangs, any existing Telnet client sessions are disconnected, with the loss of any work that was in progress at the time. However, this does not affect any other services on the host computer, and cannot affect Windows 2000 itself. You can restore operations by restarting the Telnet Server service.

For related information about this problem, please visit the following Microsoft Web site:
For additional security-related information about Microsoft products, please visit the following Microsoft Web site:

Additional query words:

Keywords : kbSecurity kbWin2000PreSP2Fix
Issue type : kbbug
Technology : kbwin2kAdvSer kbwin2kAdvSerSearch kbwin2kS kbwin2kSSearch kbwin2kSearch kbwin2kProSearch kbwin2kPro

Last Reviewed: November 15, 2000
2000 Microsoft Corporation. All rights reserved. Terms of Use.

Article ID: Q267843

Last Reviewed:
November 15, 2000

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