I installed DNN4.0.3 a couple of days ago and the installation went well. Worked out a couple of kinks in web.config and it worked fine.

But today, I began getting random security exceptions. It mostly happens when I try to add a page or a module. It will give me a security exception, and I will go back and try to do the operation again and it will give me the same error. Then I'll go browse to another page on the site and get the same exception. But then I wait about five or ten minutes and go back and do the exact same thing or create the exact same page, and it will act just like it's supposed to... So it's unrepeatable. I'm not using any modules that are out of the ordinary, either - just the ones that were provided on this site.

The site won't be live for another two or three weeks, so it's not urgent, but I can't have this random instability when it goes live. Here's what it looks like...

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Server Error in '/dnn' Application.
Security Exception
Description: The application attempted to perform an operation not allowed by the security policy. To grant this application the required permission please contact your system administrator or change the application's trust level in the configuration file.

Exception Details: System.Security.SecurityException: Request for the permission of type 'System.Security.Permissions.FileIOPermission, mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' failed.

Source Error:

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.

Stack Trace:

[SecurityException: Request for the permission of type 'System.Security.Permissions.FileIOPermission, mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' failed.]
System.Security.CodeAccessSecurityEngine.Check(Object demand, StackCrawlMark& stackMark, Boolean isPermSet) +0
System.Security.CodeAccessPermission.Demand() +59
System.IO.Path.GetFullPath(String path) +98
System.Web.Util.FileUtil.IsSuspiciousPhysicalPath(String physicalPath, Boolean& pathTooLong) +50
System.Web.Util.FileUtil.IsSuspiciousPhysicalPath(String physicalPath) +23
System.Web.CachedPathData.GetConfigPathData(String configPath) +465
System.Web.CachedPathData.GetConfigPathData(String configPath) +243
System.Web.CachedPathData.GetConfigPathData(String configPath) +243
System.Web.CachedPathData.GetVirtualPathData(VirtualPath virtualPath, Boolean permitPathsOutsideApp) +132
System.Web.HttpContext.GetFilePathData() +27
System.Web.HttpContext.GetConfigurationPathData() +26
System.Web.Configuration.HttpConfigurationSystem.System.Configuration.Internal.IInternalConfigSystem.GetSection(String configKey) +36
System.Configuration.ConfigurationManager.GetSection(String sectionName) +107
System.Configuration.ConfigurationManager.get_AppSettings() +29
DotNetNuke.Common.Utilities.DataCache.get_CachePersistenceEnabled() +4
DotNetNuke.Services.Cache.FileBasedCachingProvider.FBCachingProvider.Insert(String CacheKey, Object objObject, Boolean PersistAppRestart) +60
DotNetNuke.Common.Utilities.CBO.GetPropertyInfo(Type objType) +191
DotNetNuke.Common.Utilities.CBO.CreateObject(Type objType, IDataReader dr) +56
DotNetNuke.Common.Utilities.CBO.FillCollection(IDataReader dr, Type objType) +53
DotNetNuke.Security.Permissions.TabPermissionController.GetTabPermissionsByPortal(Int32 PortalID) +166
DotNetNuke.Entities.Tabs.TabController.FillTabInfo(IDataReader dr, Boolean CheckForOpenDataReader) +2594
DotNetNuke.Entities.Tabs.TabController.GetTab(Int32 TabId) +55
DotNetNuke.Entities.Portals.PortalSettings.GetPortalByTab(Int32 TabID, String PortalAlias) +33
DotNetNuke.HttpModules.UrlRewriteModule.OnBeginRequest(Object s, EventArgs e) +2309
System.Web.SyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +92
System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +64

Hi,

I've had the same problem - and managed to trace it to 2 x user controls that were being cached every 5 minutes.  The caching worked fine on my local machine but as soon as I uploaded it to the server, it threw a security exception error.  I think it's because the server has a security level set that does not allow this function - which is not good for performance.

According to the microsoft site, required permissions are :

I am also experiencing the same issue (in the last couple of days) with my DNN site on GoDaddy.