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The service gives up trying. In most cases, the service places a message in the event log. (Use of the event log depends on how the service was programmed by its developers.) The computer waits for the time specified in the Restart Service After box to elapse and then tries to start the service. The computer runs the program that you specify in the Run File box. For example, you could specify a program that attempts to resolve the problem or one that alerts you to the situation.

A SUS hierarchy is an orderly collection of SUS systems. At the root of the hierarchy is the parent SUS server. The parent is the only SUS server that downloads patches from Microsoft. Many child SUS servers can be configured to download patches from the parent SUS server. Child SUS servers synchronize their patch databases with the parent patch database on a daily basis. A patch that is approved on the parent server is auto matically approved on the client. Figure 5-1 shows a SUS hierarchy and its proper placement on the network. The figure shows the SUS parent server connection to Microsoft Windows Update across the organization s firewall, the SUS child servers, and production clients.

Drastic but effective, this option restarts the computer after the time specified in the Restart Computer Options dialog box elapses. In that dialog box, you can also specify a message to be broadcast (using the Messenger service, if that service is enabled) to other users on your network, warning them of the impending shutdown.

To make internal network resources available to remote DirectAccess clients, you need to do one of the following: Ensure that all internal resources that will be accessed by DirectAccess support IPv6. Deploy ISATAP on the intranet. ISATAP allows intranet servers and applications to be reached by tunneling IPv6 traffic over an IPv4 intranet. Deploy an NAT-PT device. NAT-PT devices allow hosts that only support IPv4 addresses to be accessible to DirectAccess clients using IPv6.

Because of potential security risks, the Messenger and Alerter services are disabled by default in Windows XP Service Pack 2. In earlier versions of Windows, these services were set to start automatically.

5-15

Your service fails and the failure log doesn t record it. If you set up a service to log on using an account other than the local System account and the service fails, you won t get the dump file or Dr. Watson log that the failed service would otherwise generate. This occurs because the system attempts to access the desktop of the service s logon account and it s unable to do so. To work around this problem, reconfigure the service to use the local System account and select the Allow Service To Interact With Desktop option. (Of course, this workaround doesn t help if the only way to run the service is by allowing it to log on with a different account.)

A SUS hierarchy might also be used to provide a test database of patches. Figures 5-2 and 5-3 show two options for testing patches. Figure 5-2 shows the test SUS server con nected directly to Microsoft and making patches available to representative clients on its own test network. A separate SUS hierarchy makes patches available on the produc tion network. After patches are tested in the test network, they are approved on the production parent for distribution to production clients. This design has the advantage of keeping the test network totally isolated from the production network.

Many services rely on the functions of another service. If you attempt to start a service that depends on other services, Windows first starts the others. If you stop a service upon which others are dependent, Windows also stops those services. Before you either start or stop a service, therefore, it s helpful to know what other services your action might affect. To obtain that information, go to the Dependencies tab of a service s properties dialog box, shown in Figure D-5.

Figure D-5.

Figure 5-2

As you view the properties dialog box for different services, you might notice that the service name (shown at the top of the General tab) is often different from the name that appears in the Services console (the display name) and that neither name matches the name of the service s executable file. (In fact, the executable for many services is either Services.exe or Svchost.exe.) The General tab shows all three names. Tip A detailed description of Svchost.exe appears in Knowledge Base article 314056, A description of Svchost.exe in Windows XP (http://support.microsoft.com/ kbid=314056).