Computer Hangs When You Disconnect Dial-Up Networking Connection

ID: Q185358

The information in this article applies to:

Microsoft Windows 98

IMPORTANT: This article contains information about editing the registry. Before you edit the registry, make sure you understand how to restore it if a problem occurs. For information about how to do this, view the "Restoring the Registry" Help topic in Regedit.exe or the "Restoring a Registry Key" Help topic in Regedt32.exe.

SYMPTOMS

When you are using a 700 series Fujitsu Lifebook computer with an integrated 56KflexDSVD LTModem controllerless Peripheral Component Interconnect (PCI) modem and you disconnect a dial-up networking connection, your computer may stop responding (hang).

CAUSE

This behavior can occur because the modem driver provided by Fujitsu does not work correctly with Windows 98 power management.

RESOLUTION

To resolve this issue, contact Fujitsu to obtain an updated modem driver.

To work around this issue, use the following method:

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.

Disable power management for your computer's COM port. To do so, use Registry Editor to modify the following registry key:

Hkey_Local_Machine\System\CurrentControlSet\Services\VxD\VCOMM

Change the value of the EnablePowerManagement key from "01 00 00 00" to "00 00 00 00".

When you change this value in the registry, you may experience the following behavior:

Internal modems in your computer are not power manageable, so they are always on (at a D0 state).

Any Personal Computer Memory Card International Association (PCMCIA) modem or external modem attached to a COM port on your computer stays on (at a D0 state).

If your computer is in a docking station that has a Peripheral Component Interconnect (PCI) or an Industry Standard Architecture (ISA) modem, they are always on (at a D0 state).

The third-party products discussed in this article are manufactured by a vendor independent of Microsoft; we make no warranty, implied or otherwise, regarding these products' performance or reliability.

Additional query words: 98


Keywords          : kbenv win98 
Version           : WINDOWS:
Platform          : WINDOWS 
Issue type        : kbprb

Last Reviewed: February 3, 1999