Microsoft KB Archive/934387

= Error message when you try to install a ClickOnce application from a Web server: &quot;An error occurred trying to download &quot; =

Article ID: 934387

Article Last Modified on 4/5/2007

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APPLIES TO


 * Microsoft Visual Studio 2005 Professional Edition
 * Microsoft Visual Studio 2005 Standard Edition
 * Microsoft Visual Studio 2005 Team Edition for Database Professionals
 * Microsoft Visual Studio 2005 Team Edition for Software Architects
 * Microsoft Visual Studio 2005 Team Edition for Software Developers
 * Microsoft Visual Studio 2005 Team Edition for Software Testers
 * Microsoft Visual Studio 2005 Team Suite

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SYMPTOMS
When you try to install a ClickOnce application from a Web server, installation fails. Additionally, you receive an error message that resembles the following:

URLDownloadToCacheFile failed with HRESULT '-2146697202' Error: An error occurred trying to download

This problem occurs if the following conditions are true:
 * In Microsoft Internet Explorer, the Warn if changing between secure and not secure mode advanced security option is enabled.
 * The setup URL of the ClickOnce application is redirected between a nonsecure (http) Web server and a secure (https) Web server.



CAUSE
This problem occurs because the warning pop-up window interrupts the installation of the ClickOnce application. The Bootstrapper of the ClickOnce application determines whether the program file is available at the specified Web server. When the Warn if changing between secure and not secure mode option is enabled, the Bootstrapper cannot handle the redirection between a nonsecure (http) Web server and a secure (https) Web server.



WORKAROUND
To work around this problem, use one of the following methods:
 * In Internet Explorer, disable the Warn if changing between secure and not secure mode option.
 * Make sure that the setup URL is not redirected between nonsecure (http) mode and secure (https) mode.
 * Do not redirect the setup URL. Directly use the actual setup URL.

Keywords: kbtshoot kbprb KB934387

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