Security Exception using MySQL and Entity Framework on godaddy

Question

We are getting a SecurityException when using Entity framework on godaddy. The entity has been configured against a MySQL store. (v. 6.1.2) A bit of weirdness with the exception though... Looking at the exception stack it seems to imply that if we open up a connection to MySQL anywhere in the site, then we should get the same exception; however, opening up a MySQL connection directly seems to be working in another part of the site...

Here's the verification:

using (MySqlConnection connection = new MySqlConnection(ConnectionString))
{
  connection.Open();
  ...
}

Anyone run across a similar issue?

The complete error stack trace is as follows:

[SecurityException: Request for the permission of type 'System.Security.Permissions.SecurityPermission, mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' failed.]
   System.Reflection.MethodBase.PerformSecurityCheck(Object obj, RuntimeMethodHandle method, IntPtr parent, UInt32 invocationFlags) +0
   System.Reflection.RuntimeConstructorInfo.Invoke(BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture) +470
   System.RuntimeType.CreateInstanceImpl(BindingFlags bindingAttr, Binder binder, Object[] args, CultureInfo culture, Object[] activationAttributes) +1051
   System.Activator.CreateInstance(Type type, BindingFlags bindingAttr, Binder binder, Object[] args, CultureInfo culture, Object[] activationAttributes) +111
   System.Resources.ResourceManager.CreateResourceSet(Stream store, Assembly assembly) +357
   System.Resources.ResourceManager.InternalGetResourceSet(CultureInfo culture, Boolean createIfNotExists, Boolean tryParents) +471
   System.Resources.ResourceManager.InternalGetResourceSet(CultureInfo culture, Boolean createIfNotExists, Boolean tryParents) +583
   System.Resources.ResourceManager.InternalGetResourceSet(CultureInfo culture, Boolean createIfNotExists, Boolean tryParents) +583
   System.Resources.ResourceManager.GetString(String name, CultureInfo culture) +74
   MySql.Data.MySqlClient.Resources.get_PerfMonCategoryName() +40
   MySql.Data.MySqlClient.PerformanceMonitor..ctor(MySqlConnection connection) +43
   MySql.Data.MySqlClient.MySqlConnection.Open() +434
   System.Data.EntityClient.EntityConnection.OpenStoreConnectionIf(Boolean openCondition, DbConnection storeConnectionToOpen, DbConnection originalConnection, String exceptionCode, String attemptedOperation, Boolean& closeStoreConnectionOnFailure) +173
   System.Data.EntityClient.EntityConnection.Open() +96
   System.Data.Objects.ObjectContext.EnsureConnection() +81
   System.Data.Objects.ObjectQuery`1.GetResults(Nullable`1 forMergeOption) +46
   System.Data.Objects.ObjectQuery`1.System.Collections.Generic.IEnumerable<T>.GetEnumerator() +44
   jet.Controllers.WorkOrder.WorkOrderView..ctor() +219
   jet.Controllers.WorkOrder.WorkOrderView.get_Instance() +29
   jet.Controllers.WorkItemController.Index() +11
   lambda_method(ExecutionScope , ControllerBase , Object[] ) +39
   System.Web.Mvc.ActionMethodDispatcher.Execute(ControllerBase controller, Object[] parameters) +17
   System.Web.Mvc.ReflectedActionDescriptor.Execute(ControllerContext controllerContext, IDictionary`2 parameters) +178
   System.Web.Mvc.ControllerActionInvoker.InvokeActionMethod(ControllerContext controllerContext, ActionDescriptor actionDescriptor, IDictionary`2 parameters) +24
   System.Web.Mvc.<>c__DisplayClassa.<InvokeActionMethodWithFilters>b__7() +53
   System.Web.Mvc.ControllerActionInvoker.InvokeActionMethodFilter(IActionFilter filter, ActionExecutingContext preContext, Func`1 continuation) +258
   System.Web.Mvc.<>c__DisplayClassc.<InvokeActionMethodWithFilters>b__9() +20
   System.Web.Mvc.ControllerActionInvoker.InvokeActionMethodWithFilters(ControllerContext controllerContext, IList`1 filters, ActionDescriptor actionDescriptor, IDictionary`2 parameters) +193
   System.Web.Mvc.ControllerActionInvoker.InvokeAction(ControllerContext controllerContext, String actionName) +382
   System.Web.Mvc.Controller.ExecuteCore() +123
   System.Web.Mvc.ControllerBase.Execute(RequestContext requestContext) +23
   System.Web.Mvc.ControllerBase.System.Web.Mvc.IController.Execute(RequestContext requestContext) +7
   System.Web.Mvc.MvcHandler.ProcessRequest(HttpContextBase httpContext) +144
   System.Web.Mvc.MvcHandler.ProcessRequest(HttpContext httpContext) +54
   System.Web.Mvc.MvcHandler.System.Web.IHttpHandler.ProcessRequest(HttpContext httpContext) +7
   System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +181
   System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +75

Answer 1

Justin was spot on. Problem was godaddy has an older version of the MySql dll in their gac and the entity framework was picking it up!

Here's the fix. (Apply this to web.config)

<configuration>
  ...
  <runtime>
    <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
      <dependentAssembly>
        <assemblyIdentity name="MySql.Data" publicKeyToken="c5687fc88969c44d"/>
        <bindingRedirect oldVersion="5.0.7.0" newVersion="6.1.2.0"/>
      </dependentAssembly>
    </assemblyBinding>
  </runtime>
  ...
</configuration>