I have a fresh install of DNN 4.9.0 on a Windows 2008 server (IIS 7) with a SQL2005 database.  I have granted full access to the site directory for the Network Service account.  I have followed the instructions at http://www.bestwebsites.co.nz/dotnetnuke/solving-the-dotnetnuke-redirect-loop site as I ran into this issue when initially trying to get to the newly created site.

I am having issues trying to modify my site.  With IIS .NET and the web.config trust levels set to Full the browser hangs when trying to do things as host, such as going into host settings or editing the portal.  If I set the IIS .NET trust level to Medium I get the following error:

An error has occurred.
DotNetNuke.Services.Exceptions.PageLoadException: Request for the permission of type 'System.Security.Permissions.FileIOPermission, mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' failed. ---> System.Security.SecurityException: Request for the permission of type 'System.Security.Permissions.FileIOPermission, mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' failed. at System.Security.CodeAccessSecurityEngine.Check(Object demand, StackCrawlMark& stackMark, Boolean isPermSet) at System.Security.CodeAccessPermission.Demand() at System.Reflection.Assembly.VerifyCodeBaseDiscovery(String codeBase) at System.Reflection.Assembly.get_CodeBase() at System.Reflection.Assembly.get_EscapedCodeBase() at System.Web.UI.Util.GetAssemblyPathFromType(Type t) at System.Web.UI.Util.GetAssemblySafePathFromType(Type t) at System.Web.Compilation.CompilationUtil.GetTypeFromAssemblies(AssemblyCollection assembliesCollection, String typeName, Boolean ignoreCase) at System.Web.Compilation.BuildManager.GetType(String typeName, Boolean throwOnError, Boolean ignoreCase) at System.Web.UI.Page.get_ScriptManagerType() at System.Web.UI.Page.get_IsPartialRenderingSupported() at System.Web.UI.WebControls.BaseValidator.RegisterValidatorCommonScript() at System.Web.UI.WebControls.BaseValidator.OnPreRender(EventArgs e) at System.Web.UI.Control.PreRenderRecursiveInternal() at System.Web.UI.Control.PreRenderRecursiveInternal() at System.Web.UI.Control.PreRenderRecursiveInternal() at System.Web.UI.Control.PreRenderRecursiveInternal() at System.Web.UI.Control.PreRenderRecursiveInternal() at System.Web.UI.Control.PreRenderRecursiveInternal() at System.Web.UI.Control.PreRenderRecursiveInternal() at System.Web.UI.Control.PreRenderRecursiveInternal() at System.Web.UI.Control.PreRenderRecursiveInternal() at System.Web.UI.Control.PreRenderRecursiveInternal() at System.Web.UI.Control.PreRenderRecursiveInternal() at System.Web.UI.Control.PreRenderRecursiveInternal() at System.Web.UI.Control.PreRenderRecursiveInternal() at System.Web.UI.Control.PreRenderRecursiveInternal() at System.Web.UI.Control.PreRenderRecursiveInternal() at System.Web.UI.Control.PreRenderRecursiveInternal() at System.Web.UI.Control.PreRenderRecursiveInternal() at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) The action that failed was: Demand The type of the first permission that failed was: System.Security.Permissions.FileIOPermission The Zone of the assembly that failed was: MyComputer --- End of inner exception stack trace ---

Does anybody have any ideas on how to correct this issue or for a way to troubleshoot further? 

Thanks!

Chad Welsh

I know you set your permissions, but have you recursed them top downwards (security tab/advanced/replace permissions entries on all child objects). Thanks.

I have found the resolution to this issue.  I had originally followed the instructions for the .NET 3.5 fix from http://www.bestwebsites.co.nz/dotnetnuke/solving-the-dotnetnuke-redirect-loop.  I tried following the other method (AJAX Extensions 1.0) from the same link, changed my web.config back th version 1.0.61025.0 (I had changed it to 3.5.0.0 from the previous instructions), performed an IISReset and all is working.