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Windows XP with Service Pack 2
installed has the Windows firewall enabled (by default)
as a security feature.
The Windows firewall, when enabled, can prevent Extramon
(or any network-aware software) from working properly.
To solve the problem, you must configure the Windows
firewall to treat Extramon as an exception (i.e., a
program that is allowed to receive connections over
the network). This must be done on all computers.
From the Start menu, select Control Panel and Security
Center.
From the items at the very bottom
of the window, select Windows Firewall.
Here we see that the Windows firewall
is on (which is the default setting after SP2 is installed).
If your computer is protected behind another firewall
(such as a hardware firewall) then you might want to
turn the Windows firewall off entirely. Otherwise, select
the Exceptions tab.
To add Extramon as an exception,
press the Add Program button.
Assuming that you have already
installed Extramon at this point, you will see it in
the list. Select it and then press OK.
Your Windows firewall is now configured to let other
computers connect to Extramon. Remember to do this on
all computers running Extramon.
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