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Advanced Security is likely to focus on program-based and port-based rules rather than on predefined rules. The next step after either specifying a program or a protocol and port is to specify what the firewall should do when traffic meeting that criteria is encountered. On this page, shown in Figure 8-11, you can select Allow The Connection, Allow The Connection If It Is Secure, or Block The Connection. You would use the blocking option if you wanted to keep someone who was using the computer from using a particular program or protocol. A good example of this is blocking the use of a file sharing program. After you have decided on an action, you need to specify the network profiles the rule will apply to and decide on a meaningful name and description for the rule. Names and descriptions are important because in 12 months time, when you are examining the firewall configuration of a Windows Vista computer that you set up, you will want to quickly ascertain what you were trying to accomplish with a particular rule. If you use something like Ian s Rule, you will have to edit the properties of the rule to figure out what the rule actually does.

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Figure 8-11

In this lab, you will troubleshoot an HTTP Web filter problem. The new security policy in your organization prohibits the use of MSN Messenger and Windows Messenger from your internal network to the Internet. You need to block the use of these applications on your firewall.

The public-read modifier grants readability to a variable, while writing is still controlled by its basic mode. The public-init modifier also grants public writing, but only during object declaration. Writing at other times is still controlled by the basic mode. Each modifier solves a particular problem, so the clearest way to explain their use is with a task-centric mini-FAQ, like the one up next:

Connection security rules are special rules that deal with IPSec traffic. As mentioned earlier, IPSec is a technology that protects network traffic by encrypting it and using digital signatures to verify integrity and source information. The 70-620 exam does not examine this topic in detail, but it is helpful for candidates to have a basic familiarity with connection security rule

1. On CLIENT1, start MSN Messenger or Windows Messenger from the Start menu. 2. Log on using your account. Ensure that you can access the Internet using MSN Messenger or Windows Messenger.

1. On ISA1, start ISA Server Management Console. Click Firewall Policy. 2. Right-click the Web Access Only access rule and click Configure HTTP. 3. In the Configure HTTP Policy For Rule dialog box, click the Signature tab. Click Add. 4. In the Name text box, type Block MSN Messenger. 5. From the Search In list, click Request Headers. 6. In the HTTP header box, type User-Agent. 7. In the Signature box, type MSN Messenger. 8. Click Add again. 9. In the Name text box, type Block Windows Messenger. 10. From the Search In list, click Request Headers. 11. In the HTTP header box, type User-Agent. 12. In the Signature box, type MSMSGS. 13. Click OK to close the Signature box and then click OK to close the Configure HTTP Policy For Rule dialog box. 14. Click Apply to apply the changes.

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