SNALINK.EXE - Cancel Timeout in \driver\DLC

 Last reviewed: November 6, 1997
Article ID: Q161768
The information in this article applies to:
  • Microsoft SNA Server, versions 2.0, 2.1, 2.11, 2.11 SP1, and 3.0
  • Windows NT Server, versions 3.5, 3.51, and 4.0

SYMPTOMS

When you stop the SNA Server service, the following error popup may be displayed: 

   SNALINK.EXE - Cancel Timeout
   The driver \driver\DLC failed to complete a cancelled I/O request
   in the allotted time
After clicking <OK>, the same popup may appear over and over again. The administrator may not be able to perform any other operations until this error is cleared.

CAUSE

The error message is a Windows NT "hard error popup" which occurs if the SNA Server 802.2 link service terminates while the underlying DLC.SYS driver has completed IRP's to return to the calling thread. However, the link service has already ended. This error causes Windows NT to report a system-modal hard error popup which freezes the application subsystem until the user cancels the dialog. If multiple IRP's are completing, each IRP will cause another popup to appear.

This problem will only occur when the SNA Server service is stopped, which causes underlying SNA Server link services to stop too.

RESOLUTION

WARNING: Using Registry Editor incorrectly can cause serious problems that may require you to reinstall your operating system. Microsoft cannot guarantee that problems resulting from the incorrect use of Registry Editor can be solved. Use Registry Editor at your own risk.

For information about how to edit the registry, view the "Changing Keys And Values" Help topic in Registry Editor (Regedit.exe) or the "Add and Delete Information in the Registry" and "Edit Registry Data" Help topics in Regedt32.exe. Note that you should back up the registry before you edit it.

While this error may occur during SNA Server shutdown, it is recommended that the hard error popup be suppressed by configuring the following Windows NT registry setting: 

   HKEY_CURRENT_USER/Software/Microsoft/Windows NT/CurrentVersion/Windows
   ErrorMode: REG_DWORD: 2
The default is 0 which causes the error popup to appear, requiring the user to manually clear the error. This option is not recommended for Windows NT servers which may not be accessible to users. A value of 2 causes the error to be reported to the event log and returns OK to the hard error so the system can continue. Popups don't appear. This entry is described in the Windows NT 3.5 Resource Kit Volume 4 "Optimizing Windows NT", Appendix B on page 614.

STATUS

Microsoft has confirmed this to be an operational issue with Windows NT version 3.5, 3.51, and 4.0. It is recommended that the ErrorMode entry is modified for servers which aren't normally accessible to administrator personnel.

Additional query words:
Keywords : prodsna snadlc kbnetwork kbprb
Version : 1.00
Platform : WINDOWS

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Last reviewed: November 6, 1997
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