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The information in this article applies to:
a.. Microsoft Windows 2000 Professional
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IMPORTANT: This article contains information about modifying the registry.
Before you modify the registry, make sure to back it up and make sure that
you understand how to restore the registry if a problem occurs. For
information about how to back up, restore, and edit the registry, click the
following article number to view the article in the Microsoft Knowledge
Base:
256986 Description of the Microsoft Windows Registry
SYMPTOMS
When you try to use a dial-up connection to connect to your Internet Service
Provider (ISP), you may receive the following error message during the
"Registering your computer on the network" portion of the connection
agreement:
Error 720 - the connection attempt failed because your computer and the
remote computer could not agree on PPP control protocol.
Additionally, when you view the devices in Device Manager, you may notice a
yellow exclamation mark (!) over the icon for the WAN Miniport IP (#2)
device.
CAUSE
This issue may occur if the TCP/IP protocol has become unbound from the
dial-up adapter, or if a conflict is created when a second WAN Miniport IP
device driver loads.
RESOLUTION
To resolve this issue, uninstall the TCP/IP protocol, remove the second WAN
Miniport IP device, and then reinstall the TCP/IP protocol. To do so, follow
these steps:
1.. Uninstall the TCP/IP protocol. To do so:
1.. In Control Panel, double-click Network and Dial-up Connections,
right-click Local Area Connection, and then click Properties.
2.. Under Components checked are used by this connection, click Internet
Protocol (TCP/IP), and then click Uninstall.
3.. Follow the on-screen instructions to uninstall TCP/IP.
4.. Restart the computer when prompted, but click No if you are prompted
to allow Windows to enable a protocol.
2.. Right-click My Computer, and then click Properties.
3.. Click the Hardware tab, and then click Device Manager.
4.. On the View menu, click Show hidden devices.
5.. Under Network adapters, there should be no WAN Miniport IP devices. If
a WAN Miniport IP device is listed, continue to the following step. If no
WAN Miniport IP device is listed, go directly to step 16.
6.. Click Start, click Run, type regedit in the Open box, and then click
OK.
WARNING: If you use Registry Editor incorrectly, you may cause serious
problems that may require you to reinstall your operating system. Microsoft
cannot guarantee that you can solve problems that result from using Registry
Editor incorrectly. Use Registry Editor at your own risk.
7.. Locate the following registry subkey:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\{4D36E972-E325-11C
E-BFC1-08002BE10318}
8.. On the Registry menu, click Export Registry File, type backup-key in
the File name box, and then click Save.
Note You can restore the changes that you make to this registry key. To do
so, double-click the backup-key.reg file that you saved.
9.. Click each of the registry subkeys under this key, and then view the
Data column of the DriverDesc value to determine which of the subkeys
corresponds to WAN Miniport (IP). For example, the 0005 subkey.
10.. Right-click the subkey whose DriverDesc value data is WAN Miniport
(IP) (for example, right-click 0005), and then click Delete. Click Yes to
confirm that you want to delete the key.
11.. Quit Registry Editor.
12.. Right-click My Computer, and then click Properties.
13.. Click the Hardware tab, and then click Device Manager.
14.. On the View menu, click Show hidden devices.
15.. Under Network adapters, right-click WAN Miniport (IP) and then click
Uninstall. Click OK to confirm that you want to remove this device.
16.. Reinstall the TCP/IP protocol. To do so:
1.. In Control Panel, double-click Network and Dial-up Connections,
right-click Local Area Connection, and then click Properties.
2.. Click Install.
3.. In the Select Network Component Type dialog box, click Protocol, and
then click Add.
4.. Under Network Protocol, click Internet Protocol (TCP/IP), and then
click OK.
5.. When the protocol is installed, click Close.
17.. Reset the modem by turning the power off and then on, or for an
internal modem, restart the computer.
18.. Test your Internet connectivity.
Keywords: kbprb KB810979
Technology: kbwin2000Pro kbwin2000ProSearch kbwin2000Search
Manjari
This posting is provided "AS IS" with no warranties, and confers no rights.
