Hi,
The WindowsUpdate.log is log for Windows Update Agent (WUA). It runs as service Windows Update/Automatic Updates in the context of “Local System” account.
When “detecting/downloading” update, WUA may determine proxy in different ways (Please check reference below). If authentication is required by proxy, the Caller should supply the account for authentication. For example, if IE called WUA to scan update,
IE will supply the current logon user account.
When “installing” update, it is always done in the context of “Local System” account.
Reference:
How the Windows Update client determines which proxy server to use to connect to the Windows Update Web site
http://support.microsoft.com/?id=900935
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