I'm running DNN 4.3.5.. everything seems to be okay.. except once in a while when I'm using it, I will get a security exception and everything will stop working, restarting the app seems to resolve the problem temporality. I've encountered it a few times already. That's not very stable and not acceptable. Does anyone has any idea why this will be the case or how I can track what the source of the problem is?

The error that I get is:

Server Error in '/portal' 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
System.Web.Configuration.WebConfigurationManager.get_AppSettings() +5
DotNetNuke.Common.Globals.GetDomainName(HttpRequest Request) +60
DotNetNuke.HttpModules.UrlRewriteModule.OnBeginRequest(Object s, EventArgs e) +4051
System.Web.SyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +92
System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +64

 

Go to Host > Host Settings + Advanced Settings + Performance Settings : Module Caching Method

If it is set for Disk, change it to Memory, then click on Update and Restart Application.

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After doing some research, I think I've found the problem. I'm running this on a shared hosting service which only allow for applications running in "Medium Trust" It seems like some of the third party modules I'm using are not compatible with running in medium trust....