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ITsVISTA KB-Link: KB939786

An application that is started by a non-administrative user cannot listen to the HTTP traffic of the computer on which the application is running in Windows Vista, Windows Server 2003, or Windows XP

An application attempts to listen for local loopback requests by calling HttpAddUrl for http://localhost[:port]. If the application does not have administrator privileges the call will fail with the following:

Access Denied

This problem occurs on Windows Vista if User Account Control (UAC) is enabled and the application is running under the Limited User Account.

This problem occurs when the local computer is running one of the following Microsoft Windows operating system:

  • Windows Vista
  • Windows Server 2003
  • Windows XP
There is a download that resolves this issue. See Hotfixes for details. This issue is resolved in SP1.

For more information on this issue, including potential causes, workarounds, and resolutions, see: Microsoft KB Article KB939786.

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