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How to: Configure the ClickOnce Trust Prompt Behavior

You can configure the ClickOnce trust prompt to control whether end users are given the option of installing ClickOnce applications, such as Windows Forms applications, Windows Presentation Foundation applications, console applications, WPF browser applications, and Office solutions. You configure the trust prompt by setting registry keys on each end user's computer.

The following table shows the configuration options that can be applied to each of the five zones (Internet, UntrustedSites, MyComputer, LocalIntranet, and TrustedSites).

Option

Registry setting value

Description

Enable the trust prompt.

Enabled

The ClickOnce trust prompt is display so that end users can grant trust to ClickOnce applications.

Restrict the trust prompt.

AuthenticodeRequired

The ClickOnce trust prompt is only displayed if ClickOnce applications are signed with a certificate that identifies the publisher.

Disable the trust prompt.

Disabled

The ClickOnce trust prompt is not displayed for any ClickOnce applications that are not signed with an explicitly trusted certificate.

The following table shows the default behavior for each zone. The Applications column refers to Windows Forms applications, Windows Presentation Foundation applications, WPF browser applications, and console applications.

Zone

Applications

Office solutions

MyComputer

Enabled

Enabled

LocalIntranet

Enabled

Enabled

TrustedSites

Enabled

Enabled

Internet

Enabled

AuthenticodeRequired

UntrustedSites

Disabled

Disabled

You can override these settings by enabling, restricting, or disabling the ClickOnce trust prompt.

Enable the trust prompt for a zone when you want end users to be presented with the option of installing and running any ClickOnce application that comes from that zone.

To enable the ClickOnce trust prompt by using the registry editor

  1. Open the registry editor:

    1. Click Start, and then click Run.

    2. In the Open box, type regedit32, and then click OK.

  2. Find the following registry key:

    \HKEY_LOCAL_MACHINE\SOFTWARE\MICROSOFT\.NETFramework\Security\TrustManager\PromptingLevel

    If the key does not exist, create it.

  3. Add the following subkeys as String Value, if they do not already exist, with the associated values shown in the following table.

    String Value subkey

    Value

    Internet

    Enabled

    UntrustedSites

    Disabled

    MyComputer

    Enabled

    LocalIntranet

    Enabled

    TrustedSites

    Enabled

    For Office solutions, Internet has the default value AuthenticodeRequired and UntrustedSites has the value Disabled. For all others, Internet has the default value Enabled.

To enable the ClickOnce trust prompt programmatically

  1. Create a Visual Basic or Visual C# console application in Visual Studio.

  2. Open the Program.vb or Program.cs file for editing and add the following code.

    Microsoft.Win32.RegistryKey key;
    key = Microsoft.Win32.Registry.LocalMachine.CreateSubKey("SOFTWARE\\MICROSOFT\\.NETFramework\\Security\\TrustManager\\PromptingLevel");
    key.SetValue("MyComputer", "Enabled");
    key.SetValue("LocalIntranet", "Enabled");
    key.SetValue("Internet", "AuthenticodeRequired");
    key.SetValue("TrustedSites", "Enabled");
    key.SetValue("UntrustedSites", "Disabled");
    key.Close();
    
  3. Build and run the application.

Restrict the trust prompt so that solutions must be signed with Authenticode certificates that have known identity before users are prompted for a trust decision.

To restrict the ClickOnce trust prompt by using the registry editor

  1. Open the registry editor:

    1. Click Start, and then click Run.

    2. In the Open box, type regedit, and then click OK.

  2. Find the following registry key:

    \HKEY_LOCAL_MACHINE\SOFTWARE\MICROSOFT\.NETFramework\Security\TrustManager\PromptingLevel

    If the key does not exist, create it.

  3. Add the following subkeys as String Value, if they do not already exist, with the associated values shown in the following table.

    String Value subkey

    Value

    UntrustedSites

    Disabled

    Internet

    AuthenticodeRequired

    MyComputer

    AuthenticodeRequired

    LocalIntranet

    AuthenticodeRequired

    TrustedSites

    AuthenticodeRequired

To restrict the ClickOnce trust prompt programmatically

  1. Create a Visual Basic or Visual C# console application in Visual Studio.

  2. Open the Program.vb or Program.cs file for editing and add the following code.

    Microsoft.Win32.RegistryKey key;
    key = Microsoft.Win32.Registry.LocalMachine.CreateSubKey("SOFTWARE\\MICROSOFT\\.NETFramework\\Security\\TrustManager\\PromptingLevel");
    key.SetValue("MyComputer", "AuthenticodeRequired");
    key.SetValue("LocalIntranet", "AuthenticodeRequired");
    key.SetValue("Internet", "AuthenticodeRequired");
    key.SetValue("TrustedSites", "AuthenticodeRequired");
    key.SetValue("UntrustedSites", "Disabled");
    key.Close();
    
  3. Build and run the application.

You can disable the trust prompt so that end users are not given the option to install solutions that are not already trusted in their security policy.

To disable the ClickOnce trust prompt by using the registry editor

  1. Open the registry editor:

    1. Click Start, and then click Run.

    2. In the Open box, type regedit, and then click OK.

  2. Find the following registry key:

    \HKEY_LOCAL_MACHINE\SOFTWARE\MICROSOFT\.NETFramework\Security\TrustManager\PromptingLevel

    If the key does not exist, create it.

  3. Add the following subkeys as String Value, if they do not already exist, with the associated values shown in the following table.

    String Value subkey

    Value

    UntrustedSites

    Disabled

    Internet

    Disabled

    MyComputer

    Disabled

    LocalIntranet

    Disabled

    TrustedSites

    Disabled

To disable the ClickOnce trust prompt programmatically

  1. Create a Visual Basic or Visual C# console application in Visual Studio.

  2. Open the Program.vb or Program.cs file for editing and add the following code.

    Microsoft.Win32.RegistryKey key;
    key = Microsoft.Win32.Registry.LocalMachine.CreateSubKey("SOFTWARE\\MICROSOFT\\.NETFramework\\Security\\TrustManager\\PromptingLevel");
    key.SetValue("MyComputer", "Disabled");
    key.SetValue("LocalIntranet", "Disabled");
    key.SetValue("Internet", "Disabled");
    key.SetValue("TrustedSites", "Disabled");
    key.SetValue("UntrustedSites", "Disabled");
    key.Close();
    
  3. Build and run the application.

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