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Summary

After you configure alert definitions, you must manage the alerts that are created. Many of the ISA Server alerts are used to report on detected intrusion attempts. If you configure the intrusion-detection alerts to shut down the ISA Firewall Service, then ISA Server will go into lockdown mode when the service is shut down. You will need to manage the ISA Server lockdown mode. You can manage all alerts in the Alerts view of the Monitoring Node in the ISA Server Management Console. It is important to manage this list to easily recognize the most recent alerts as well as to purge alerts that are no longer relevant.

A primary reason for using alerts is for intrusion detection. Intrusion detection identifies when an attack is attempted against your network and then triggers an alert. You can configure the alert actions that ISA Server will perform in the event of a detected intrusion attempt.

Figure 12-5

For more information about the intrusion-detection options available with ISA Server, see 7, Configuring ISA Server as a Firewall.

In this chapter we ve seen in greater depth how to use the standard scene graph nodes to build fairly sophisticated pieces of UI, we ve looked at how to include images and video in our JavaFX applications, and we ve played around with gradient paints. We ve also seen our first example of plugging an effect (reflection) into the scene graph. Writing good scene graph code is all about planning. JavaFX gives you some powerful raw building blocks; you have to consider the best way to fit them together for the effect you re trying to achieve. Always be aware that a scene graph is a different beast than something like Swing or Java 2D. It s a structured representation of the graphics on screen, and as such we need to ensure it includes layout and spacing information, because we don t have direct control of the actual pixel painting as we do in Java 2D. Transparent shapes can be used to enforce spacing around parts of our scene graph, but they can also be used as a central event target.

Elevated privileges are required to hide updates, so you need to either supply credentials or click Continue as prompted to close the User Access Control (UAC) dialog box. If you then press F5 to refresh the Check For Updates dialog box, the hidden update should no longer be listed. If you decide that you should not have hidden an update after all, you can first restore it and then (if you want to) install it. To do this, you open Windows Update and click Restore Hidden Updates. In the Restore Hidden Updates dialog box, you select the update or updates that you want to restore, as shown in Figure 12-6, and click Restore.

If your ISA Server is exposed to the Internet, it is almost inevitable that it will be exposed to intrusion attempts. When an attack occurs, it may seem that the first line of defense is to disconnect from the Internet, isolating the compromised network from the attack. However, this is not recommended for most attacks. By default, ISA Server raises an alert when it detects an intrusion attempt and writes an event to the event log. In most cases, you should not modify the default as ISA Server is capable of blocking the known intrusion attempts. In some cases, you may get hundreds of intrusion attempts in a day, all of which are successfully blocked. However, there may be some cases where you want to enable additional actions when ISA Server detects an intrusion attempt. For example, if a new vulnerability is discovered in an application server, you may want to configure ISA Server to detect an attack aimed at the vulnerability and shut down the ISA Server Firewall Service if it detects the attack. This should be a temporary measure until you can fix the application server vulnerability.

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Figure 12-6

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