Automatic Updates Cannot Download Updates and Event ID 16 Is Logged

Symptoms

When Automatic Updates tries to download updates, the download does not succeed, and Event ID 16 is recorded in the system log. This behavior occurs even though you can successfully download updates from the Microsoft Windows Update Web site, http://update.microsoft.com.

Cause

This behavior may occur if both of the following conditions are true:
  • In your computer's Local Area Network (LAN) settings, the Automatically detect settings check box is selected.
  • You cannot ping the Web Proxy Auto-Discovery (WPAD) server by its Domain Name System (DNS) name. This behavior may occur if your computer's connection-specific DNS suffix does not match the DNS domain where the WPAD server's DNS entry is registered.
For your computer to automatically detect LAN settings, the WPAD server's DNS entry must be correctly configured, and a DNS query from your computer must successfully resolve the name WPAD.mydomain.com, where mydomain.com is the connection-specific DNS domain. If a DNS query from Automatic Updates cannot resolve the name of the WPAD server, Automatic Updates cannot use the WPAD server.

Resolution

To resolve this behavior, make sure that the WPAD server's DNS entry is correctly configured, and make sure that your computer's connection-specific DNS suffix matches the DNS domain where the WPAD server's DNS entry is registered.

Status

This behavior is by design.

More Information

If you use Dynamic Host Configuration Protocol (DHCP), you can configure the 015 DNS Domain Name option on the DHCP server to set the connection-specific DNS suffix of the client computers. After you configure this option, you must release and then renew the DHCP lease on the client computers.

To configure your DHCP server to set the connection-specific DNS suffix for its client computers, follow these steps:
  1. If you use a Windows 2000 Server-based computer as your DHCP server, click Start, point to Programs, point to Administrative Tools, and then click DHCP.

    If you use a Windows XP-based computer as your DHCP server, click Start, click Control Panel, click Performance and Maintenance, click Administrative Tools, and then double-click DHCP.

    If you use a Windows Server 2003-based computer as your DHCP server, click Start, point to Administrative Tools, and then click DHCP.
  2. Double-click the name of your server, right-click Server Options, and then click Configure Options.
  3. In the Available Options list, click 015 DNS Domain Name.
  4. Under Data entry, in the String value box, type the connection-specific domain name that you want the client computers to use as their connection-specific DNS suffix.

    Note The connection-specific domain name must match the domain where the WPAD server's DNS entry is registered--for example, mydomain.com.
  5. Click OK.
To release and to renew the DHCP lease on the client computers, and to confirm that the computer can resolve the WPAD server name, follow these steps:
  1. From the command prompt, type ipconfig /release, and then press ENTER.
  2. Type ipconfig /renew, and then press ENTER.
  3. Type ping WPAD.mydomain.com, where mydomain.com is the connection-specific DNS domain, and then press ENTER.

    Note If the computer successfully resolves the name of the WPAD server, you see a series of messages that include the words "Reply from."
Egenskaper

Artikel-id: 824208 – senaste granskning 3 feb. 2011 – revision: 1

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