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POError after moving from ASP.Net 3.5 to 4.0 using Nginx + FastCGI-Mono-Server4
 

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  1. POError after moving from ASP.Net 3.5 to 4.0 using Nginx + FastCGI-Mono-Server4
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    <p>I'm using Nginx + FastCGI-Mono-Server to host a small asp.net web service. It is running just fine using FastCGI-Mono-Server2 (which is the .Net 2.0 version). I now need to upgrade the asp.net app to .net 4.0. That means I need to upgrade to FastCGI-Mono-Server4. I put all the correct files in place. It works! However, it consistently crashes with a mysterious error.</p> <p>Here is the error:</p> <p>Exception: System.Runtime.FatalException</p> <p>Message: Object reference not set to an instance of an object.</p> <p>StackTrace: at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage4(MessageRpc&amp; rpc) at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage31(MessageRpc&amp; rpc) at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage3(MessageRpc&amp; rpc) at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage2(MessageRpc&amp; rpc) at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage11(MessageRpc&amp; rpc) at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage1(MessageRpc&amp; rpc) at System.ServiceModel.Dispatcher.MessageRpc.Process(Boolean isOperationContextSet) at System.ServiceModel.Dispatcher.ChannelHandler.DispatchAndReleasePump(RequestContext request, Boolean cleanThread, OperationContext currentOperationContext) at System.ServiceModel.Dispatcher.ChannelHandler.HandleRequest(RequestContext request, OperationContext currentOperationContext) at System.ServiceModel.Dispatcher.ChannelHandler.AsyncMessagePump(IAsyncResult result) at System.ServiceModel.Dispatcher.ChannelHandler.OnAsyncReceiveComplete(IAsyncResult result) at System.Runtime.Fx.AsyncThunk.UnhandledExceptionFrame(IAsyncResult result) at System.Runtime.AsyncResult.Complete(Boolean completedSynchronously) at System.ServiceModel.Channels.FramingDuplexSessionChannel.TryReceiveAsyncResult.OnReceive(IAsyncResult result) at System.Runtime.Fx.AsyncThunk.UnhandledExceptionFrame(IAsyncResult result) at System.Runtime.AsyncResult.Complete(Boolean completedSynchronously) at System.ServiceModel.Channels.SynchronizedMessageSource.ReceiveAsyncResult.OnReceiveComplete(Object state) at System.ServiceModel.Channels.SessionConnectionReader.OnAsyncReadComplete(Object state) at System.ServiceModel.Channels.SocketConnection.FinishRead() at System.ServiceModel.Channels.SocketConnection.AsyncReadCallback(Boolean haveResult, Int32 error, Int32 bytesRead) at System.ServiceModel.Channels.OverlappedContext.CompleteCallback(UInt32 error, UInt32 numBytes, NativeOverlapped* nativeOverlapped) at System.Runtime.Fx.IOCompletionThunk.UnhandledExceptionFrame(UInt32 error, UInt32 bytesRead, NativeOverlapped* nativeOverlapped) at System.Threading._IOCompletionCallback.PerformIOCompletionCallback(UInt32 errorCode, UInt32 numBytes, NativeOverlapped* pOVERLAP)</p> <p>InnerException: System.NullReferenceException</p> <p>Message: Object reference not set to an instance of an object.</p> <p>StackTrace: at System.Web.HttpApplication.ThreadContext.Enter(Boolean setImpersonationContext) at System.Web.HttpApplication.OnThreadEnterPrivate(Boolean setImpersonationContext) at System.Web.AspNetSynchronizationContext.CallCallbackPossiblyUnderLock(SendOrPostCallback callback, Object state) at System.Web.AspNetSynchronizationContext.CallCallback(SendOrPostCallback callback, Object state) at System.Web.AspNetSynchronizationContext.Post(SendOrPostCallback callback, Object state) at System.ServiceModel.Dispatcher.ThreadBehavior.BindCore(MessageRpc&amp; rpc, Boolean startOperation) at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage4(MessageRpc&amp; rpc)</p> <p>I do have a IHttpAsyncHandler in the project. I wonder if it is somehow related to that. When I searched my error I found people (like this: <a href="https://stackoverflow.com/questions/2959704/wcf-callback-exception-after-updating-to-net-4-0">wcf callback exception after updating to .net 4.0</a>) recommending this attribute:</p> <p>[CallbackBehavior(UseSynchronizationContext=false)]</p> <p>From what I can tell that is a WCF thing and is unrelated to my asp.net web server. Any ideas would be appreciated!</p> <p>EV</p>
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    1. COI think you want to ensure this is not null.. System.Web.HttpApplication.ThreadContext.Enter(Boolean setImpersonationContext) because it is at the top of your stack in the second thread.
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