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Many types of firewalls are available. Most, such as Microsoft Internet Acceleration and Security server, start with the premise that all traffic should be blocked by default and require that the administrator configure access rules. Many provide additional services such as intrusion detection/protection and VPNs. Several issues reduce the effective ness of firewalls as border controls:

32

In previous versions of Windows, a diagnostic tool with the colorful name of Dr. Watson for Windows was enabled by default. Dr. Watson, shown in Figure 32-7, generated various kinds of crash dump files in the event of application errors. The doctor plays this role no longer, at least by default. He is still present in Windows XP, however (%SystemRoot%\System32\Drwtsn32.exe), and he does go back on duty if you disable Windows Error Reporting. If you experience a repeatable application error and you call Microsoft Support Services for help, the technician you talk to might ask that you disable Windows Error Reporting (see the previous section), reenact the crash, collect a Dr. Watson log, and upload the log to Microsoft.

To provide access to resources, ports must be opened, and the more ports that are opened, the less protection the firewall can offer. Common ports, such as port 80, are used for other types of traffic for many things other than anonymous access to Web sites the original use of the port. Because many organizations open this port to allow access to a Web site, much additional traffic, some which might not be harmless, is allowed through. Far too many organizations still believe that because they use a firewall, they are protected from everything even though they might not have even properly configured the firewall. These organizations believe the firewall is security.

Figure 32-7.

To mitigate these issues, use the following best practices:

When you experience problems at startup, you can choose from a similar set of options on two separate menus. From Windows XP Professional and Home Edition, you can access the Advanced Options menu, shown here, by pressing F8 at the menu that prompts you to choose an operating system. (If Windows starts without displaying a startup menu, press F8 after your system finishes displaying startup messages from the BIOS but before the Windows logo appears.)

Carefully control which ports are opened. Ports should not be arbitrarily opened to serve some whim. A formal approval process must be followed that will ensure there is a legitimate business reason for opening the port and the security ramifi cations have been properly evaluated.

32

If Windows hangs at startup, use the power switch or the reset button to restart your system. You should see the Startup Recovery menu, shown here, which offers many of the same troubleshooting options as the Advanced Options menu.

3-11

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As in previous Windows versions, Windows XP gives you the option to start your system in Safe Mode if you re unable to reliably start in normal mode In Safe Mode, Windows uses only those services and drivers that are absolutely required to start your system The operating system starts with a minimal set of drivers and services, using a generic video driver at a resolution of 640 480, with support for your keyboard, mouse, monitor, local storage, and default system services In Safe Mode, Windows does not install support for audio devices and nonessential peripherals, including most devices connected via USB ports (USB keyboards and mice may be used in Safe Mode only if your system BIOS includes the option to recognize and enable these devices.