If you receive Windows Update error 8024402C while checking for updates, you might need to do one of the following:
This error might be caused by a program running on your computer that's preventing Windows Update Services (SVCHOST) from accessing the Internet. Programs that might do this include firewalls, antispyware software, web accelerators, Internet security or antivirus programs. and proxy servers.
If you have any of these programs running, you might need to turn them off while downloading and installing updates. We recommend that you turn them back on after updating your computer. For more information, see Windows Update error 80072efd.
If your computer is connected to a network at work, you probably receive updates using Windows Server Update Services (WSUS), a service that enables network administrators to deploy and manage updates for all computers on a network.
If this describes your computer, contact a network administrator. For more information about WSUS, go to the Windows Server Update Services (WSUS) website. For more information on keeping a network updated, see Keeping computers on a network up to date.
If your computer is usually connected to a network at work (for example, if you use a laptop but you're currently using it at home or at another location), you probably receive updates using WSUS and can't receive updates by connecting directly to the Internet or to another network, such as a home network.
To solve the problem, connect to the network at work and try checking for updates again, or contact a network administrator. To see if your computer's updates are being managed by a WSUS server, follow these steps:
Open Windows Update by clicking the Start button . In the search box, type Update, and then, in the list of results, click Windows Update.
If your computer is managed by WSUS, you will see You receive updates: Managed by your system administrator near the bottom of the page.
If your computer is being managed by WSUS, you can try connecting to the WSUS server either at your workplace, or through a Virtual Private Network (VPN). If this doesn't work, you can try connecting directly to the Microsoft Update website by doing the following:
Click Check online for updates from Microsoft Update.
If your computer is connected directly to the Internet or to a home network (and never connected to a network at work), you might need to set your browser to automatically detect local area network (LAN) settings so Windows Update can go online to obtain updates. To do this, follow the steps below.
Open Internet Options by clicking the Start button , clicking Control Panel, clicking Network and Internet, and then clicking Internet Options.
Click the Connections tab, and then click LAN Settings.
Under Automatic configuration, select the Automatically detect settings check box, and then click OK.
An incorrect Domain Name System (DNS) setting for your network connection can also cause this error. Windows Update servers are accessible through DNS servers set up for typical Internet access. If a local DNS server has been modified for some reason, the Windows Update client might not be able to find and connect to the Windows Update server. Check your local DNS to ensure it's set for typical Internet access. For more information about DNS settings, see Change TCP/IP settings
If you continue to see this error, see this automatic troubleshooter
on the Microsoft Support website, or go to the Microsoft Answers
website for more assistance.