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A ClickOnce application or a WPF XAML browser application displays no notification that asks whether you want to run the application when you try to run the application in the Internet Zone in Internet Explorer
Article ID: 2562394 - View products that this article applies to.
Consider the following scenario:
This issue occurs because by default, ClickOnce applications and WPF XBAPs do not display notification dialog boxes when you run the applications in "online-only" mode.
To resolve this issue, install the specific security update for your system that is described in Bulletin MS11-044. For more information, visit the following Microsoft webpage:
The signature-verification process for ClickOnce applications and for WPF XBAPs is updated to help you recognize when you are running untrusted applications from the Internet Zone. After you install the MS11-044 security update, you see an Application Run dialog box that is typically encountered when you use Internet Explorer to access an application over the Internet.
If existing ClickOnce applications or WPF XBAPs are expected to run from the Internet in online-only mode without dialog boxes being presented, changes may have to be made to those applications for the applications to continue to run correctly after MS11-044 is installed.
To revert to the application's start behavior after you install the update, use one of the following methods:
How to add a trusted publisher
How to: Add a Trusted Publisher to a Client Computer for ClickOnce Applications
How to add a URL to the Trusted Sites list
Security zones: adding or removing websites
Also in this updateIn addition to the changes that are listed in the "Vulnerability Information" section of bulletin MS11-044, this security update also deprecates ClickOnce support for MD2 and MD4 hash. After the update is applied, applications that are signed with an MD2 or MD4 hash will no longer run.