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This article has been archived.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.
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).