ClickOnce TrustNotGrantedException exception RRS feed

  • Question

  • Hi,

    There is windows forms application, whick is deployed using ClickOnce.  

    For some reason some clients (5 of >100) experience problems with ClickOnce update, method  CheckForUpdate fails with TrustNotGrantedException exception. Application is signed with "real" certificate. 
    Any idea what can be the reason?

    Unfortunately I cannot reproduce the problem locally.

    OS version: Microsoft Windows NT 6.1.7601 Service Pack 1

    System.Deployment.Application.TrustNotGrantedException: User has refused to grant required permissions to the application.   at System.Deployment.Application.ApplicationTrust.RequestTrust(SubscriptionState subState, Boolean isShellVisible, Boolean isUpdate, ActivationContext actCtx, TrustManagerContext tmc)   at System.Deployment.Application.DeploymentManager.DetermineTrustCore(Boolean blocking, TrustParams tp)   at System.Deployment.Application.DeploymentManager.DetermineTrust(TrustParams trustParams)   at System.Deployment.Application.ApplicationDeployment.CheckForDetailedUpdate(Boolean persistUpdateCheckResult)   at System.Deployment.Application.ApplicationDeployment.CheckForUpdate()


    Wednesday, March 19, 2014 2:42 PM


  • Hi,
    A client machine exposes a wide variety of resources that a managed application can have access to, including the file system, the Registry, printing services, the user interface, reflection, and environment variables. Before a managed application can access any of the resources on a client machine, it must have .NET Framework 3.0 Code Access Security (CAS) permission to do so.
    You’d better follow steps below to fix your issue:
    1. Try to a new certificate in ClickOnce deployment application.
    2. Using the Code Access Security Policy Tool to add code access security.
    For example:

    C:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\CasPol -q -machine

    -addgroup All_Code -url http://localhost/MyTestApp/* FullTrust

    -n MyTestApp -polchgprompt off

    I think you could refer to this Akshay's Blog about ClickOnce Deployment failed due to improper trusts:

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    Thursday, March 20, 2014 9:00 AM