I'm afraid not specifying it would allow any app to make a remote call.
When I specify it, there is a strange message: "Windows Services have been restricted with rules that allow expected behavior only.
I recently uninstalled Zone Alarm and have decided to use Windows Firewall as my firewall as Zone Alarm was causing me grief when I was syncing my iphone.
Anyway, I've noticed just then that Windows Firewall seems to block my Windows updates.
Windows Defender Firewall, commonly known as Windows Firewall, is a firewall component of Microsoft Windows.
Every type of network connection, whether it is wired, wireless, VPN, or even Fire Wire, has the firewall enabled by default, with some built-in exceptions to allow connections from machines on the local network.
XP's Windows Firewall cannot block outbound connections; it is only capable of blocking inbound ones.
Windows Firewall turned out to be one of the two most significant reasons (the other being DCOM activation security) that many corporations did not upgrade to Service Pack 2 in a timely fashion.
It also fixed a problem whereby the firewall policies would not be enabled on a network connection until several seconds after the connection itself was created, thereby creating a window of vulnerability.
A number of additions were made to Group Policy, so that Windows system administrators could configure the Windows Firewall product on a company-wide level.