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I have an ASP.NET WebForms app using Microsoft ASP.NET Universal Providers (NuGet) for membership and roles. Under full trust everything works fine, but when I edit web.config to specify medium trust I get this error when loading a page that accesses the membership: Type 'System.Web.Providers.DefaultMembershipProvider' cannot be instantiated under a partially trusted security policy (AllowPartiallyTrustedCallersAttribute is not present on the target assembly). I've searched the web and haven't found much info about whether this is a known limitation or if there is a workaround. I'm working on the open source app Gallery Server Pro, which is distributed in the MS Web Gallery and must support medium trust environments. Any insight? [Edit] Per the request, here is the web.config stuff (I'm not using profiles or the session state provider): <membership defaultProvider="DefaultMembershipProvider"> <providers> <clear /> <add name="DefaultMembershipProvider" applicationName="Gallery Server Pro" connectionStringName="GalleryDb" passwordFormat="Clear" enablePasswordRetrieval="true" enablePasswordReset="true" requiresQuestionAndAnswer="false" requiresUniqueEmail="false" maxInvalidPasswordAttempts="50" minRequiredPasswordLength="2" minRequiredNonalphanumericCharacters="0" passwordAttemptWindow="10" type="System.Web.Providers.DefaultMembershipProvider, System.Web.Providers, Version=1.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" /> </providers> </membership> <roleManager enabled="true" cacheRolesInCookie="true" cookieProtection="Validation" defaultProvider="DefaultRoleProvider"> <providers> <clear /> <add name="DefaultRoleProvider" applicationName="Gallery Server Pro" connectionStringName="GalleryDb" type="System.Web.Providers.DefaultRoleProvider, System.Web.Providers, Version=1.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364

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