title: Hosting ASP.NET MVC Application: Security Exception
body: <p>I Have an ASP.NET MVC 5 application that works fine on the development machine. I published it and transferred the files online, and it generates the following error:</p>
  
  <pre><code>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 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 failed.]
     System.Security.CodeAccessSecurityEngine.ThrowSecurityException(RuntimeAssembly asm, PermissionSet granted, PermissionSet refused, RuntimeMethodHandleInternal rmh, SecurityAction action, Object demand, IPermission permThatFailed) +165
     System.Security.CodeAccessSecurityEngine.ThrowSecurityException(Object assemblyOrString, PermissionSet granted, PermissionSet refused, RuntimeMethodHandleInternal rmh, SecurityAction action, Object demand, IPermission permThatFailed) +100
     System.Security.CodeAccessSecurityEngine.CheckSetHelper(PermissionSet grants, PermissionSet refused, PermissionSet demands, RuntimeMethodHandleInternal rmh, Object assemblyOrString, SecurityAction action, Boolean throwException) +272
     System.Security.CodeAccessSecurityEngine.CheckSetHelper(CompressedStack cs, PermissionSet grants, PermissionSet refused, PermissionSet demands, RuntimeMethodHandleInternal rmh, RuntimeAssembly asm, SecurityAction action) +55
     System.RuntimeTypeHandle.GetTypeByName(String name, Boolean throwOnError, Boolean ignoreCase, Boolean reflectionOnly, StackCrawlMarkHandle stackMark, IntPtr pPrivHostBinder, Boolean loadTypeFromPartialName, ObjectHandleOnStack type) +0
     System.RuntimeTypeHandle.GetTypeByName(String name, Boolean throwOnError, Boolean ignoreCase, Boolean reflectionOnly, StackCrawlMark&amp; stackMark, IntPtr pPrivHostBinder, Boolean loadTypeFromPartialName) +70
     System.RuntimeType.GetType(String typeName, Boolean throwOnError, Boolean ignoreCase, Boolean reflectionOnly, StackCrawlMark&amp; stackMark) +39
     System.Type.GetType(String typeName) +50
     System.CodeDom.Compiler.CompilerInfo.get_IsCodeDomProviderTypeValid() +10
     System.Web.Compilation.CompilationUtil.GetRecompilationHash(CompilationSection ps) +2090
     System.Web.Configuration.CompilationSection.get_RecompilationHash() +107
     System.Web.Compilation.BuildManager.CheckTopLevelFilesUpToDateInternal(Int64 cachedHash) +465
     System.Web.Compilation.BuildManager.CheckTopLevelFilesUpToDate(Int64 cachedHash) +51
     System.Web.Compilation.BuildManager.ExecutePreAppStart() +132
     System.Web.Hosting.HostingEnvironment.Initialize(ApplicationManager appManager, IApplicationHost appHost, IConfigMapPathFactory configMapPathFactory, HostingEnvironmentParameters hostingParameters, PolicyLevel policyLevel, Exception appDomainCreationException) +521
  </code></pre>
  
  <p>My hosting provides me with an ASP.NET Settings panel.</p>
  
  <p>My settings are as follows:</p>
  
  <pre><code>Framework version: 4.0.30319.17929
  Default webpage language: C#
  CAS trust level: FULL
  </code></pre>
  
  <p>Can anyone guide me as to what is the problem. Is it the app or the hosting?</p>