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attempt to figure out which ports are open on the computer, which services are running, the update state of the computer, and so on. When a remote computer tries to connect to a non-listening TCp port (a TCp port that is not used on the local computer), the TCp/Ip stack sends back a special TCp packet called TCp Reset (RST). However, if an application is listening on that port but a firewall is blocking it from receiving traffic, the remote computer will simply time out. This is a common technique to fingerprint the computer and see which ports are unused and which are used but blocked by the firewall. With the stealth feature of Windows Firewall, all TCp RST outbound packets are blocked so that the remote computer will time out when it connects to a port that is not allowed through the firewall, regardless of whether this port is in use. For UDp ports and non-TCp/UDp sockets, a similar mechanism is used. Unlike TCp, these are not session-based protocols, so when a remote computer tries to connect to a non-listening UDp port (or a non-TCp/UDp socket), the stack replies back with an ICMp packet saying nobody s home. For Ipv4 traffic, the response is ICMpv4 (protocol 1)/type 3/code 3 (Destination Unreachable/port Unreachable) or ICMpv4 (protocol 1)/type 3/code 2 (Destination Unreachable/protocol Unreachable). For Ipv6 UDp traffic, the response is ICMpv6 (protocol 58)/type 1. With the stealth feature on, Windows Firewall blocks these outbound responses so that the remote computer can t tell the difference between a non-listening UDp port (or non-TCp/UDp socket) and one that is listening but is blocked by the firewall.

Windows 7 now allows services to register to be started or stopped whenever a trigger event occurs, a new feature known as Trigger Start services. This eliminates the need for services to start when the system starts, which can improve boot performance . It also eliminates the need for services to poll or actively wait for an event to occur . In other words, services can now start when they are needed instead of having to starting automatically regardless of whether there is work for the service to do . Beginning with Windows 7, the WFP and Windows Firewall with Advanced Security now work together to implement service triggers based on WFP filters . This helps stop unneeded services on the computer and only start them when Windows Firewall with Advanced Security has been configured to allow traffic for such services . For more information on how Windows Firewall uses service triggers, see the sidebar titled Direct from the Source: Service DemandStart on Firewall Triggers in this chapter . For additional information concerning Trigger Start services, see the section titled Services Enhancements in Windows 7 in 17, Managing Devices and Services . diReCt FRoM tHe SoURCe

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Figure 2-8. The Function Key Display toolbar adjusts to show various options when you press Shift, Ctrl, and Alt alone or in any combination.

efore Windows 7, a number of services like peer Name Resolution protocol (pNRp), Simple Service Discovery protocol (SSDp) Discovery Service (SSDpSRV),

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and other services, start up on initial boot and continue to run regardless of whether there are any consumers of their functionality and traffic is blocked through Windows Firewall with advanced Security. The consuming applications are using a platform that is supposed to be always available; therefore, the services must always be running to be ready for the application. The new Demand-Start service on Windows Firewall is designed to provide a way to reduce the number of services that are running at any given time and thereby improve performance. This service has a system-wide impact including improvement to boot-time, increase in battery life, lessened memory usage, and so on. Services configured with appropriate firewall triggers will only start when a consuming application starts and requests to open ports in the firewall to allow its traffic. Services can also be started and stopped (or notified) by the changes in profiles. For example, remote management of Windows Firewall is only possible when the policy agent is running. accordingly, there is a trigger related to the Windows Firewall Remote Management rules so that if you enable the Windows Firewall group, Windows Firewall Remote Management, the policy agent service is started (see the following examples). This feature also works with third-party firewalls if they are designed correspondingly.

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