generate barcode using vb.net Protecting a System with Windows Firewall in C#.NET

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Protecting a System with Windows Firewall
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Figure 31-3 The Monitoring page shows at a glance which profile is active in this case, Public.
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By default, Windows Firewall blocks many types of outgoing and incoming ICMP message types. By creating a rule using Windows Firewall With Advanced Security, you can allow certain types of ICMP packets. Follow these steps to enable ICMP Echo Requests, Type 8, into your computer through Windows Firewall: 1. In the console tree of Windows Firewall With Advanced Security, click Inbound Rules. 2. In the Action pane, click New Rule. This opens the New Inbound Rule wizard. 3. Click Custom, as shown on the next page, to indicate that you d like to create a custom rule and click Next. 4. Select All Programs and click Next. Doing so indicates that this rule should apply to all programs on this computer. Note that you could also select a specific program or service to which this rule should apply.
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Protecting a System with Windows Firewall
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5. On the Protocols And Ports page, select ICMPv4 as the Protocol Type and then click Customize.
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6. In the Customize ICMP Settings dialog box, select Specific ICMP Types, select Echo Request, and then click OK. Click Next to continue. 7. The Scope page appears, where you can specify the IP addresses to which the rule will apply. (The Customize button leads to a dialog box wherein you can specify which types of interface local area network, remote access, or wireless the rule will affect.) Leave these settings as-is and click Next. 8. On the Action page, you specify what you d like to happen when a packet matching this rule is received. In this example, you d like to allow the packet, so the default is acceptable. Click Next to continue. 9. On the Profile page you specify which profiles (Domain, Public, or Private) this rule applies to. Leave them all selected and click Next. 10. On the Name page, you give the rule a name. Choose something short but descriptive; for our example, type IPv4 ICMP Echo Request. Click Finish to complete the wizard. The new rule now appears in the list of Inbound Rules in Windows Firewall With Advanced Security.
31 Advanced Security Management
Configuring Complex Rules
Windows Vista includes collections of related firewall rules; in Windows Firewall With Advanced Security, each collection is called a group. Each group allows or blocks certain types of network traffic. Tagging rules with a group name makes them much easier to find than identifying them only by port or program name; in addition, you can quickly find all the rules that pertain to a particular firewall exception. For example, one group of rules (which happens to be a group of one) allows the Remote Desktop Protocol (RDP) to come into the computer. This saves you from having to know that RDP operates on TCP port 3389 in order to configure a rule for it. Examining the rule for Remote Desktop reveals several details about its configuration that are interesting and some that might warrant a change in order to secure it even more. In the Inbound Rules list, find the Remote Desktop (TCP-In) rule; the easiest way is to click Filter By Group and select Remote Desktop. Double-click the rule to open its properties dialog box. On the General tab of the Remote Desktop (TCP-In) Properties dialog box, shown in Figure 31-4, you can see that the rule is enabled.
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Figure 31-4 As the note at the top of the General page explains, some settings in predefined rules like this one cannot be modified; to make changes, you must create a new rule.
Protecting a System with Windows Firewall
Because this rule is predefined, the Protocols And Ports tab, shown in Figure 31-5, doesn t allow any settings modifications but can be used to view the protocol and port settings to which this rule applies.
Figure 31-5 The settings on this tab are unavailable because it s a predefined rule.
The Advanced tab, shown in Figure 31-6 on the next page, enables you to set the profile or profiles to which this rule will apply along with setting of the interface types for the rule.
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