Troubleshoot the problem further by identifying why the client cannot communicate with the WSUS server using HTTP. If you can reach the WSUS server, verify that the client is configured correctly.
If you are using Group Policy settings to configure Windows Update, use the Resultant Set of Policy (RSOP) tool (Rsop.msc) to check the computer’s effective configuration.
New content is added to the Windows Update Web site regularly, so users can always get the most recent and secure updates and solutions.
Windows XP Service Pack 2 provides a number of new Group Policy settings that control communication between components in the operating system and sites on the Internet.
To identify the source of the problem, follow these steps: 1. This can be done in two different ways—by checking the client’s registry (the most reliable technique) or, if you use Windows Server Update Services (WSUS), by checking the Reports page on the WSUS Web site. Examine any error messages returned by the Windows Update client by viewing the client’s %System Root%\Windows file.
This text file contains detailed output from the Windows Update client, including notifications for each attempt to find, download, and install updates.
Windows Update has been the bane of my existence -- until now.
Here's why: While I appreciate the convenience of automatic downloads and installs, I do not appreciate automatic restarts.