DLC May Send I-frames on a Disconnected Connection

This article was previously published under Q282798
This article has been archived. It is offered "as is" and will no longer be updated.
The Data Link Control (DLC) protocol may send I-frames on a connection that is in disconnected state.
This issue occurs because there is a problem with the computer that uses the DLC protocol.

Windows NT 4.0

A supported fix is now available from Microsoft, but it is only intended to correct the problem that is described in this article. Apply it only to computers that are experiencing this specific problem.

To resolve this problem, 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, visit the following Microsoft Web site: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-language version of this fix should have the following file attributes or later:
   Date        Time    Size     File name  Platform   ------------------------------------------------   07/12/2000  05:08p   55,376  dlc.sys    Intel   07/12/2000  05:06p  102,512  dlc.sys    Alpha				


Windows NT 4.0

Microsoft has confirmed that this is a problem in Windows NT 4.0.

Windows 2000

Microsoft has confirmed that this is a problem in Windows 2000. This problem was first corrected in Windows 2000 Service Pack 2.
The DLC protocol is attempting to send I-frames on a connection that is in a disconnected state. The DLC protocl specification does not allow this behavior. This problem can occur when Cisco routers use Data-Link Switching (DLSW).

Article ID: 282798 - Last Review: 10/21/2013 05:11:51 - Revision: 2.3

  • Microsoft Windows 2000 Server
  • Microsoft Windows 2000 Advanced Server
  • Microsoft Windows 2000 Professional Edition
  • Microsoft Windows NT Workstation 4.0 Developer Edition
  • Microsoft Windows NT Server 4.0 Standard Edition
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