Quote from "Windows XP Inside Out eBook, Chapter 32
Remote Access Options":
Other Internet services stop working when you make a VPN
connection.
When you make a VPN connection, you might find that you
can no longer browse the Internet using Internet
Explorer, hold conversations using Windows Messenger, or
use other applications that access the Internet. This
occurs when the VPN connection is configured to use the
default gateway on the remote network for Internet
access. When you make a VPN connection, Windows adds to
the IP routing table a new default route that uses the
connection to the VPN server. That new route is assigned
the lowest metric, which means that it's used in place of
your original default route-and therefore prevents access
to some locations. Although this is a useful feature when
you connect to some corporate networks, it's generally of
little use when you're connecting to a single computer or
a small workgroup.
To fix the problem, follow these steps:
In Control Panel open Network Connections, right-click
the VPN connection, and choose Properties.
Click the Networking tab, select Internet Protocol
(TCP/IP), and click Properties.
In the Internet Protocol (TCP/IP) Properties dialog box,
click Advanced.
On the General tab of the Advanced TCP/IP Settings dialog
box, clear the Use Default Gateway On Remote Network
check box.
You should then be able to use other Internet
applications while your VPN connection is active.
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