zxing generate qr code example c# Understanding Windows Firewall with Advanced Security in Visual C#.NET

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Understanding Windows Firewall with Advanced Security
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Windows Firewall and Service Triggers
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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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Service Demand-Start on Firewall Triggers
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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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CHapTER 26 Configuring Windows Firewall and IPsec
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If the BFE service is stopped, all registered services are started.
How It Works
Every service can register its Windows Firewall Demand-Start parameters with the SCM. When the BFE is starting, it will enumerate all installed services and query each of them for firewall trigger information. after starting up, BFE will monitor all filter additions and deletions and fire appropriate events to the Unified Background process Manager (UBpM) via its ETW channel. For more information about this topic, see http://msdn.microsoft.com/en-us/library/dd405512.aspx.
The Firewall Trigger
a firewall trigger consists of at least two and up to four of the following elements:
port number (or a Remote procedure Call [RpC] token for dynamic port allocation) protocol number application that listens on the port (optional) Service name (optional; for SvcHost.exe, the service name can be specified to scope only the trigger to the service)
n n n
To determine whether a service has registered a firewall trigger you can use the sc command as follows.
c:\>sc qtriggerinfo policyagent [SC] QueryServiceConfig2 SUCCESS SERVICE_NAME: policyagent START SERVICE FIREWALL PORT EVENT : b7569e07-8421-4ee0-ad10-86915afdad09 [PORT OPEN] DATA : RPC;TCP;%windir%\system32\svchost.exe;policyagent;
The DaTa section describes the firewall trigger as follows:
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