VPN Error 720 - the connection
attempt failed because your computer and the remote computer could not agree
on PPP control protocol - Case 2
Uninstall/Reinstall the TCP/IP
Protocol
Symptoms:
1.When attempting to establish a VPN, you may receive the
following error message during the "Registering your computer on the
network":
Error 720 - the connection attempt
failed because your computer and the remote computer could not agree on PPP
control protocol.
2. If you view the devices in
Device Manager, you may notice a yellow exclamation mark (!) over the
icon for the WAN Miniport IP (#2) device.
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:
a.
In Control Panel,
double-click Network and Dial-up Connections, right-click
Local Area Connection, and then click Properties.
b.
Under
Components checked are used by this connection, click
Internet Protocol (TCP/IP), and then click Uninstall.
c.
Follow the
on-screen instructions to uninstall TCP/IP.
d.
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.
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:
a.
In Control Panel,
double-click Network and Dial-up Connections, right-click
Local Area Connection, and then click Properties.
b.
Click Install.
c.
In the Select
Network Component Type dialog box, click Protocol, and
then click Add.
d.
Under Network
Protocol, click Internet Protocol (TCP/IP), and then
click OK.
e.
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.
If it is XP, you may use netsh to reset TCP/IP
following these links,
How to reset TCP/IP in Windows
XP. When viewing the list of components for a network interface
in Windows XP, you may notice that the Uninstall button is
...
www.howtonetworking.com/Windows/resettcpip1.htm
Symptom: When attempting to
establish a VPN connection to Windows RRAS, you may receive the
following error message: Error 720: No PPP control
protocols ...
www.chicagotech.net/VPN/error720.htm
Click DNS and WINS tabs to assign
the VPN server's DNS and WINS. ... To assign the DNS and
WINS to a VPN client for name resolution, you should configure
...
www.chicagotech.net/nameresolutionpnvpn.htm
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