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4. Click Add to add an extension to the list. 5. When you click Add, the Extension dialog box opens, as shown in Figure 7-19. Provide the extension (which is case-sensitive) and a description, and then click OK.

Figure 8-2

6. Select Block Requests Containing Ambiguous Extensions if you want to block content when ISA Server cannot determine the extension. A typical use of extension blocking is to block executable files such as .exe, .bat, or .cmd files. Another example is to use extension blocking to prevent worm attacks. For example, the Code Red Worm uses a header that included GET http://<ipaddress>/ default.ida so you could stop the worm from entering the network by blocking .ida extensions. You can also use file extensions to enforce organizational policies that restrict the types of data that can be downloaded.

Selecting the Off option completely disables Windows Firewall. The most likely reason why you might want to disable Windows Firewall is if you want to install a third-party software firewall on your Windows Vista computer and you want to allow this firewall, rather than the one that ships with Windows Vista, to manage your computer s network security. It is important to note that you should not disable Windows Firewall just because you have another firewall between your computer and the network, such as a small office/home office (SOHO) router or Network Address Translation (NAT) device. It is perfectly normal to have firewalls active even when your computer is on a protected network. It might be that another computer on your protected network is infected by a worm. Dropping your firewall could lead to your computer becoming infected, even though the protected network is theoretically safe. Using a firewall is not always a sign of paranoia. On the network, anyone could be out to get you! To apply Windows Firewall to certain connections only, you should click the Advanced tab, as shown in Figure 8-3. You can remove or apply the firewall to each configured network connection on your computer by selecting or clearing the check box next to its name. From this tab, it is also possible to restore Windows Firewall to its default settings. You should click this button if you are concerned that specific exceptions have made the computer insecure. The problem with doing this is that you will need to re-create all necessary exceptions as the need for them arises.

From its first release in 1995 Java had featured a powerful technology for deploying rich applications within a web page. So called Java applets could be placed on any page, just like an image, and ran inside a secure environment that prevented unauthorized tampering with the underlying operating system (figure 1.4). While applets boosted the visibility of the Java brand, the idea initially met with mixed success. The applet was a hard-core programming technology in a world dominated by artists and designers, and while many page authors drooled over Java s power, few understood how to install an applet onto their own site, let alone how to create one from scratch. Java applet s main rival was Macromedia Flash, an animation and presentation tool boasting a more designer-friendly development experience. Once Macromedia s plugin began to gain ground, the writing was on the wall for the humble Java applet. Already Sun was starting to ignore user-facing Java in favor of big back-end systems running enterprise web applications. The Java applet vanished almost as quickly as it arrived.

When a client sends a request to a Web server, or when the server responds, the first part of that response is always the HTTP request or response.

The HTTP request from the client includes the client s HTTP method (such as GET) as well as the URI that the client is requesting and the protocol version. The server HTTP response contains the protocol version followed by a numeric status code and its associated textual phrase. For example, if the server responds with a 2xx code, the server is indicating that the request was successfully received,

8

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Figure 8-3

Figure 1.4 An applet (the game 3D-Blox) runs inside a web page, living alongside other web content like text and images.