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Editorial Team
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Asked: 2026-05-15T13:15:14+00:00

I have installed an ASP.NET 4.0 Web forms application in IIS 7.5. If I

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I have installed an ASP.NET 4.0 Web forms application in IIS 7.5. If I set the application pool to DefaultAppPool (.NET Framework 2.0) I get the icons for Providers, .NET-Roles and .NET-Users displayed on the configuration page for the application in IIS Manager and I can manage users and roles within IIS. (I’m using Forms authentication.)

But if I set the application pool to ASP.NET v4.0 I get a problem: Double clicking on the icons for Users or Roles in IIS Manager throws an error telling me that I cannot use these features since the providers could not be determined as trusted. If I set in administration.config in the trustedProviders section allowUntrustedProviders=”true” and double click again on one of the icons I get the error that the assembly System.Web, Version 4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a could not be found. If I restart IIS Manager the icons disappear completely.

.NET Framework 4.0 is definitely installed. So this is all quite confusing. I know that .NET 4 uses another GAC than the old one for .NET 2-3. Could it be possible that IIS Manager is not able to find the new GAC for .NET 4? Do I have to add perhaps some of the new 4.0 assemblies to administration.config? Is there another way to add users and roles instead of IIS?

Thank you for help in advance!

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1 Answer

  1. Editorial Team

    Unfortunately, currently those features are not supported if your Application Pool is using .NET 4.0 since that would require IIS Manager to load the .NET 4.0 framework in order to call the right providers (and that is why .NET Users/Membership, .NET Roles, etc), and it is not possible since IIS Manager is a .NET 2.0 application.

    So for now there is no good workaround, other than changing your Application Pool temporarily to 2.0 and adding them and then switching back to 4.0. But of course you should not do this unless its just a development machine.

    Otherwise you could build a page using the CreateUserWizard control and use the built-in Login controls from ASP.NET which should be a one line (of markup) to get similar functionality.

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