http://support.microsoft.com/kb/886185

After you set up Microsoft Windows Firewall in Microsoft Windows XP Service
Pack 2 (SP2), you may discover that your computer can be accessed by anyone
on the Internet when you use a dial-up connection to connect to the
Internet.

This problem occurs because of the way that Windows Firewall interprets
local subnets when the �My network (subnet) only� option is used. Windows
Firewall is included with Windows XP SP2.

Because of the way that some dialing software configures routing tables,
Windows Firewall in Windows XP SP2 can sometimes interpret the whole
Internet to be a local subnet. This can let anyone on the Internet access
the Windows Firewall exceptions. When the "My network (subnet) only" option
is enabled, it is automatically selected for file and print sharing.
Therefore, your shared drives can be unexpectedly revealed on the Internet
when you use a dial-up connection.

To resolve this problem, you must download and install the Critical Update
for Windows XP (KB886185)

...how many ways can Redmond say "oops?"

-rick
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