How can I resolve System.MethodAccessException: Attempt to access a private/protected method failed. in Unity WebPlayer Deployment?

Hi,

I have the following run-time problem only with the webplayer in deployment. I am using Unity 3.5.5f3 on Windows 7 64bit with IE 9.0.8112.16421(32-bit)(both dev & deployment environments are this environment). I have also tested deployment in Firefox/Palemoon 3.6.3 (32-bit Mozilla based) with the same results.

I attempt the deployment via the File-->Build Settings console window. When running as a PC and Mac Standalone and as a Web Player in the IDE my app works ok. It is only on deployment (via the Web Player Build and Run) I have this issue.

I have found a similar issue here, but it is not exactly the same & its contents did not help me: http://answers.unity3d.com/questions/49048/unity-31-webplayer-access-method-failed.html

I have a series of C# files included in my Unity project based on the RabbitMQ 2.8.7 Client. A newer version (3.0.0) can be found here: https://www.rabbitmq.com/releases/rabbitmq-dotnet-client/v3.0.0/rabbitmq-dotnet-client-3.0.0.zip

Again, everything works fine in the PC and Mac Standalone and as a Web Player in the IDE. My Start() method sets up the ConnectionFactory parameters, then tests the prefetch and attempts to create a connection shown below:

//////////////START CODE///////////////////////////////////////

     void Start () {
         ConnectionFactory cf = new ConnectionFactory();
         
         cf.UserName = "admin";
         cf.Password = "admin";
         cf.VirtualHost = "/carbon";
         cf.Protocol = Protocols.FromEnvironment();
         cf.HostName = "192.168.111.12";
         cf.Port = 5672;
         //cf.Uri = serverAddress;
 
         bool isOpen = Security.PrefetchSocketPolicy(sHostName, iPort, 500);
         if (isOpen) 
             sPrefetchMsg = "Prefetch on " + sHostName + ":" + iPort.ToString() + " success!";
         else
             sPrefetchMsg = "Prefetch on " + sHostName + ":" + iPort.ToString() + " failed.";
         
         Debug.LogWarning(sPrefetchMsg);        
         
     
         try{
         conn = cf.CreateConnection();}
         catch (Exception ex){
             sEMsg = ex.ToString();
             Debug.LogWarning(sEMsg);
         }
         
         ch = conn.CreateModel();
         string queueName = ensureQueue(ch);
         sub = new Subscription(ch, queueName);
         
         messageThread = new Thread(new ThreadStart(receiveMessages));
         
         messageThread.Start();
     }

//////////////END CODE////////////////////////////////////////

In the WebPlayer deployment environment where things do not work, the prefetch still works, but the resulting error I print to the screen as is as follows:

 //////////////BEGIN RUN-TIME OUTPUT//////////////////////////////////
 None of the specified endpoints were reachable Endpoints attempted:
 --------------------------------------------
 endpoint=amqp-0-9://192.168.111.12:5672, attempts=1
 System.MethodAccessException: Attempt to access a private/protected method failed.
 at System.Security.SecurityManager.ThrowException (System Exception ex)[0x00000] in <filename unknown>:0
 at ManagedCodeSubscriber.SocketFrameHandler_0_9..ctor (ManagedCodeSubscriber.AmqpTcpEndpoint endpoint)[0x00000] in <filename unknown>:0
 at ManagedCodeSubscriber.Framing.Impl.v0_9.ProtocolBase.CreateFrameHandler (ManagedCodeSubscriber.AmqpTcpEndpoint endpoint)[0x00000] in <filename unknown>:0...
 ======================================
 Stack trace:
 at ManagedCodeSubscriber.ConnectionFactory.CreateConnection(Int32 maxRedirects)[0x00000] in <filename unknown>:0
 at ManagedCodeSubscriber.ConnectionFactory.CreateConnection()[0x00000] in <filename unknown>:0
 at Subscriber.Start()[0x00000] in <filename unknown>:0
 //////////////END RUN-TIME OUTPUT//////////////////////////////////

Any help in resolving this WebPlayer specific issue or suggested work-arounds is much appreciated!

Thanks