Develop Reference

ObjectDisposedException SslStream and TcpClient

I am using a TcpClient with an SslStream. In general everything works fine but we are getting occasional logs of crashes. It seems to be coming from unstable network connections, and I'm unfortunately not able to reproduce it locally despite trying to create "unexpected circumstances":
using Fiddler to replicate a very slow network connection
killing the server application while its sending data
disconnecting network cables
The situation is this:
I call BeginRead like this:
_tcpClientStream.BeginRead(receiveBuffer, 0, receiveBuffer.Length, pfnCallBack, null);
And then EndRead is being called like this:
iRx = _tcpClientStream.EndRead(asyn);
The only place that the iRx is used is to copy the received data to a new array:
var bytes = new byte[iRx];
Array.Copy(receiveBuffer, bytes, iRx);
In the OnDataReceived callback function, I call EndRead on the SslStream, which throws an exception that is handled:
Error in OnDataReceived System.IO.IOException: The read operation failed, see inner exception. ---> System.ArgumentOutOfRangeException: Specified argument was out of the range of valid values.
Parameter name: size
at System.Net.Sockets.NetworkStream.BeginRead(Byte[] buffer, Int32 offset, Int32 size, AsyncCallback callback, Object state)
at System.Net.FixedSizeReader.StartReading()
at System.Net.FixedSizeReader.ReadCallback(IAsyncResult transportResult)
--- End of inner exception stack trace ---
at System.Net.Security._SslStream.EndRead(IAsyncResult asyncResult)
at System.Net.Security.SslStream.EndRead(IAsyncResult asyncResult)
at XXXXXXX.OnDataRecevied(IAsyncResult asyn)
Normally this is not a problem - this exception is caught and the TcpClient is closed and re-initiated to attempt to reconnect.
However, in this case there is a second Exception that is thrown and comes from one of the UnhandledException error handlers:
AppDomain.CurrentDomain.UnhandledException
Current.DispatcherUnhandledException
Current.Dispatcher.UnhandledException
TaskScheduler.UnobservedTaskException
This stack trace is like this:
System.ObjectDisposedException: Cannot access a disposed object.
Object name: 'System.Net.Sockets.NetworkStream'.
at System.Net.Sockets.NetworkStream.EndRead(IAsyncResult asyncResult)
at System.Net.FixedSizeReader.ReadCallback(IAsyncResult transportResult)
at System.Net.LazyAsyncResult.Complete(IntPtr userToken)
at System.Net.ContextAwareResult.CompleteCallback(Object state)
at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
at System.Net.ContextAwareResult.Complete(IntPtr userToken)
at System.Net.LazyAsyncResult.ProtectedInvokeCallback(Object result, IntPtr userToken)
at System.Net.Sockets.BaseOverlappedAsyncResult.CompletionPortCallback(UInt32 errorCode, UInt32 numBytes, NativeOverlapped* nativeOverlapped)
at System.Threading._IOCompletionCallback.PerformIOCompletionCallback(UInt32 errorCode, UInt32 numBytes, NativeOverlapped* pOVERLAP)
Our handling for this type of unhandled error is to display a message to the user that there is a fatal error and the software has to close.
My questions are:
Has anyone ever seen this error before and been able to reproduce the exact out of range exception I'm getting? Despite my attempts to recreate the issue (using the methods described above), I'm not able to ever recreate the exception, it is always the more standard Socket IO exception:
Unable to read data from the transport connection: An existing connection was forcibly closed by the remote host. ---> System.Net.Sockets.SocketException: An existing connection was forcibly closed by the remote host
at System.Net.Sockets.Socket.EndReceive(IAsyncResult asyncResult)
at System.Net.Sockets.NetworkStream.EndRead(IAsyncResult asyncResult)
--- End of inner exception stack trace ---
at System.Net.Security._SslStream.EndRead(IAsyncResult asyncResult)
at System.Net.Security.SslStream.EndRead(IAsyncResult asyncResult)
at XXXXXXXXX.OnDataRecevied(IAsyncResult asyn)
Is there any way I can handle this exception in my Socket code or is it always going to appear in one of these UnhandledException events? If so, what is the best practice way of handling this? Basically I need some logic in the event handler to identify that the software should not shut down if this specific error is received?

An unhandled exception was generated during the execution of the current web request.[HttpAntiForgeryException]

I have a C# .NET MVC app and I am getting "anti-forgery token could not be decrypted". I don't know where the error is and I need help resolving this issue. And I am running this application on my localhost. Below is the error I am getting.
Server Error in '/' Application.
The anti-forgery token could not be decrypted. If this application is hosted by a Web Farm or cluster, ensure that all machines are running the same version of ASP.NET Web Pages and that the <machineKey> configuration specifies explicit encryption and validation keys. AutoGenerate cannot be used in a cluster.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.
Exception Details: System.Web.Mvc.HttpAntiForgeryException: The anti-forgery token could not be decrypted. If this application is hosted by a Web Farm or cluster, ensure that all machines are running the same version of ASP.NET Web Pages and that the <machineKey> configuration specifies explicit encryption and validation keys. AutoGenerate cannot be used in a cluster.
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:
[HttpAntiForgeryException (0x80004005): The anti-forgery token could not be decrypted. If this application is hosted by a Web Farm or cluster, ensure that all machines are running the same version of ASP.NET Web Pages and that the <machineKey> configuration specifies explicit encryption and validation keys. AutoGenerate cannot be used in a cluster.]
System.Web.Helpers.AntiXsrf.AntiForgeryTokenSerializer.Deserialize(String serializedToken) +337
System.Web.Helpers.AntiXsrf.AntiForgeryTokenStore.GetFormToken(HttpContextBase httpContext) +91
System.Web.Helpers.AntiXsrf.AntiForgeryWorker.Validate(HttpContextBase httpContext) +44
System.Web.Helpers.AntiForgery.Validate() +92
System.Web.Mvc.ValidateAntiForgeryTokenAttribute.OnAuthorization(AuthorizationContext filterContext) +18
System.Web.Mvc.ControllerActionInvoker.InvokeAuthorizationFilters(ControllerContext controllerContext, IList`1 filters, ActionDescriptor actionDescriptor) +97
System.Web.Mvc.Async.<>c__DisplayClass21.<BeginInvokeAction>b__19(AsyncCallback asyncCallback, Object asyncState) +743
System.Web.Mvc.Async.WrappedAsyncResult`1.CallBeginDelegate(AsyncCallback callback, Object callbackState) +14
System.Web.Mvc.Async.WrappedAsyncResultBase`1.Begin(AsyncCallback callback, Object state, Int32 timeout) +128
System.Web.Mvc.Async.AsyncControllerActionInvoker.BeginInvokeAction(ControllerContext controllerContext, String actionName, AsyncCallback callback, Object state) +343
System.Web.Mvc.Controller.<BeginExecuteCore>b__1c(AsyncCallback asyncCallback, Object asyncState, ExecuteCoreState innerState) +25
System.Web.Mvc.Async.WrappedAsyncVoid`1.CallBeginDelegate(AsyncCallback callback, Object callbackState) +30
System.Web.Mvc.Async.WrappedAsyncResultBase`1.Begin(AsyncCallback callback, Object state, Int32 timeout) +128
System.Web.Mvc.Controller.BeginExecuteCore(AsyncCallback callback, Object state) +465
System.Web.Mvc.Controller.<BeginExecute>b__14(AsyncCallback asyncCallback, Object callbackState, Controller controller) +18
System.Web.Mvc.Async.WrappedAsyncVoid`1.CallBeginDelegate(AsyncCallback callback, Object callbackState) +20
System.Web.Mvc.Async.WrappedAsyncResultBase`1.Begin(AsyncCallback callback, Object state, Int32 timeout) +128
System.Web.Mvc.Controller.BeginExecute(RequestContext requestContext, AsyncCallback callback, Object state) +374
System.Web.Mvc.Controller.System.Web.Mvc.Async.IAsyncController.BeginExecute(RequestContext requestContext, AsyncCallback callback, Object state) +16
System.Web.Mvc.MvcHandler.<BeginProcessRequest>b__4(AsyncCallback asyncCallback, Object asyncState, ProcessRequestState innerState) +52
System.Web.Mvc.Async.WrappedAsyncVoid`1.CallBeginDelegate(AsyncCallback callback, Object callbackState) +30
System.Web.Mvc.Async.WrappedAsyncResultBase`1.Begin(AsyncCallback callback, Object state, Int32 timeout) +128
System.Web.Mvc.MvcHandler.BeginProcessRequest(HttpContextBase httpContext, AsyncCallback callback, Object state) +384
System.Web.Mvc.MvcHandler.BeginProcessRequest(HttpContext httpContext, AsyncCallback callback, Object state) +48
System.Web.Mvc.MvcHandler.System.Web.IHttpAsyncHandler.BeginProcessRequest(HttpContext context, AsyncCallback cb, Object extraData) +16
System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +103
System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +155

When ASP.NET generates the token, it uses some machine key for that. If you later try to decrypt that token with another key, you will get this type of exception.
It is very strange that you can get this by just running localhost, since this usually happens on a load balanced scenario e.g. when you have not set up the machine key to be the same.
Another possible reason is that you manipulate the token on the frontend somehow or get the web page from another machine, though both scenarios seem to be unlikely.
Anyway, if you have troubles with the load balancing or something like this, you need to set up the same machine key in all web.config files.

C# SignalR within a class library

I've been developing a Web Service (C# WebAPI2) so can simply send messages using SignalR and then store the message transcript within a TSQL database. However, after moving the SignalR hubs within a class library I can't seem to access them now. I have developed a very simply console application to communicate with the Web Service but I am getting a strange exception being thrown.
Here is the exception which is being thrown:
"StatusCode: 500, ReasonPhrase: 'Internal Server Error', Version: 1.1,
Content: System.Net.Http.StreamContent, Headers:\r\n{\r\n
Transfer-Encoding: chunked\r\n X-SourceFiles:
=?UTF-8?B?QzpcRGV2ZWxvcG1lbnRcU291cmNlQ29kZVxTVVBTZXJ2aWNlXFNVUC5TZXJ2aWNlXHNpZ25hbHJcbmVnb3RpYXRl?=\r\n
Cache-Control: private\r\n Date: Wed, 11 Mar 2015 10:50:18 GMT\r\n
Server: Microsoft-IIS/8.0\r\n X-AspNet-Version: 4.0.30319\r\n
X-Powered-By: ASP.NET\r\n Content-Type: text/html;
charset=utf-8\r\n}"
An unhandled exception of type 'System.AggregateException' occurred
in SignalR Client Connection.exe
The Owin Startup file is placed within the Web Service App_Start folder, here is what it looks like:
using System;
using System.Threading.Tasks;
using Microsoft.Owin;
using Owin;
using Microsoft.AspNet.SignalR;
[assembly: OwinStartup(typeof(Service.App_Start.Startup))]
namespace Service.App_Start
{
public class Startup
{
public void Configuration(IAppBuilder app)
{
app.Map("/signalr", map =>
{
var hubConfiguration = new HubConfiguration
{
EnableDetailedErrors = true,
EnableJSONP = true
};
map.RunSignalR(hubConfiguration);
});
}
}
}
Many thanks.

I am not sure the details in your case, but for me I found that I was receiving the System.AggregationException:
System.AggregateException was unhandled
HResult=-2146233088
Message=One or more errors occurred.
Source=mscorlib
StackTrace:
at System.Threading.Tasks.Task.ThrowIfExceptional(Boolean includeTaskCanceledExceptions)
at System.Threading.Tasks.Task.Wait(Int32 millisecondsTimeout, CancellationToken cancellationToken)
at System.Threading.Tasks.Task.Wait()
at Client.CommunicationHandler.AddMessage(String method, String args, String serverUri, String hubName) in c:\Workspace\EnvisionRealTimeRemoteOps\CodeProjectSelfHostedBroadcastServiceSignalRSample\Client\CommunicationHandler.cs:line 24
at Client.Program.Main(String[] args) in c:\Workspace\EnvisionRealTimeRemoteOps\CodeProjectSelfHostedBroadcastServiceSignalRSample\Client\Program.cs:line 15
at System.AppDomain._nExecuteAssembly(RuntimeAssembly assembly, String[] args)
at System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySecurity, String[] args)
at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly()
at System.Threading.ThreadHelper.ThreadStart_Context(Object state)
at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
at System.Threading.ThreadHelper.ThreadStart()
InnerException: System.Net.Http.HttpRequestException
HResult=-2146233088
Message=An error occurred while sending the request.
InnerException: System.Net.WebException
HResult=-2146233079
Message=Unable to connect to the remote server
Source=System
StackTrace:
at System.Net.HttpWebRequest.EndGetResponse(IAsyncResult asyncResult)
at System.Net.Http.HttpClientHandler.GetResponseCallback(IAsyncResult ar)
InnerException: System.Net.Sockets.SocketException
HResult=-2147467259
Message=No connection could be made because the target machine actively refused it 127.0.0.1:8083
Source=System
ErrorCode=10061
NativeErrorCode=10061
StackTrace:
at System.Net.Sockets.Socket.EndConnect(IAsyncResult asyncResult)
at System.Net.ServicePoint.ConnectSocketInternal(Boolean connectFailure, Socket s4, Socket s6, Socket& socket, IPAddress& address, ConnectSocketState state, IAsyncResult asyncResult, Exception& exception)
InnerException:
Until I added a call to the following:
WebApp.Start("http://localhost:8083"); // Put your desired URL in...
Please note that in my case my application is using Self-Hosted SignalR.

Strange webserver exception after patching web farm

We recently patched our 12 servers, now have been getting the following exceptions across all servers when hitting URL similar to this... (URL has been modified)
http://thedomain.com/WebResource.axd?d=yj6P234W1h22bOvqe2sdf2f=
System.Web.HttpException - Invalid viewstate.
Stack trace:
at System.Web.UI.Page.DecryptStringWithIV(String s, IVType ivType)
at System.Web.Handlers.AssemblyResourceLoader.System.Web.IHttpHandler.ProcessRequest(HttpContext context)
at System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)
UPDATE
at System.Web.Configuration.MachineKeySection.EncryptOrDecryptData(Boolean fEncrypt, Byte[] buf, Byte[] modifier, Int32 start, Int32 length, IVType ivType, Boolean useValidationSymAlgo, Boolean signData)
at System.Web.UI.Page.DecryptStringWithIV(String s, IVType ivType)
at System.Web.Handlers.ScriptResourceHandler.DecryptParameter(NameValueCollection queryString)
at System.Web.Handlers.ScriptResourceHandler.ProcessRequestInternal(HttpResponse response, NameValueCollection queryString, VirtualFileReader fileReader)
at System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)

This sounds like you have different encryption keys for the servers, which results in one server not being able to decrypt ViewState generated on a different server. See the following for additional information on how to fix it:
How To: Configure MachineKey in ASP.NET 2.0
Generate Machine Key Elements for Web Farms

Getting ProtocolException with running DotNetOpenAuth sample

I have downloaded DotNetOpenAuth-3.4.6.10357 built it (had to exclude OpenIdOfflineProvider because of build errors) and run OAuthConsumerWpf. After clicking Authorize I got the exception below. Please bear in mind I modified app.config as instructed. This is from the Google tab. I also tried Generic tab with the same results.
What could be wrong here? Shouldn't things as simple as this work out of the box?
DotNetOpenAuth.Messaging.ProtocolException was unhandled
Message=Error occurred while sending a direct message or getting the response.
Source=DotNetOpenAuth
StackTrace:
at DotNetOpenAuth.Messaging.StandardWebRequestHandler.GetResponse(HttpWebRequest request, DirectWebRequestOptions options) in c:\Users\andarno\git\dotnetopenid\src\DotNetOpenAuth\Messaging\StandardWebRequestHandler.cs:line 172
at DotNetOpenAuth.Messaging.StandardWebRequestHandler.GetResponse(HttpWebRequest request) in c:\Users\andarno\git\dotnetopenid\src\DotNetOpenAuth\Messaging\StandardWebRequestHandler.cs:line 100
at DotNetOpenAuth.Messaging.Channel.GetDirectResponse(HttpWebRequest webRequest) in c:\Users\andarno\git\dotnetopenid\src\DotNetOpenAuth\Messaging\Channel.cs:line 607
at DotNetOpenAuth.Messaging.Channel.RequestCore(IDirectedProtocolMessage request) in c:\Users\andarno\git\dotnetopenid\src\DotNetOpenAuth\Messaging\Channel.cs:line 628
at DotNetOpenAuth.Messaging.Channel.Request(IDirectedProtocolMessage requestMessage) in c:\Users\andarno\git\dotnetopenid\src\DotNetOpenAuth\Messaging\Channel.cs:line 451
at DotNetOpenAuth.Messaging.Channel.Request[TResponse](IDirectedProtocolMessage requestMessage) in c:\Users\andarno\git\dotnetopenid\src\DotNetOpenAuth\Messaging\Channel.cs:line 431
at DotNetOpenAuth.OAuth.ConsumerBase.PrepareRequestUserAuthorization(Uri callback, IDictionary`2 requestParameters, IDictionary`2 redirectParameters, String& requestToken) in c:\Users\andarno\git\dotnetopenid\src\DotNetOpenAuth\OAuth\ConsumerBase.cs:line 222
at DotNetOpenAuth.OAuth.DesktopConsumer.RequestUserAuthorization(IDictionary`2 requestParameters, IDictionary`2 redirectParameters, String& requestToken) in c:\Users\andarno\git\dotnetopenid\src\DotNetOpenAuth\OAuth\DesktopConsumer.cs:line 42
at DotNetOpenAuth.ApplicationBlock.GoogleConsumer.RequestAuthorization(DesktopConsumer consumer, Applications requestedAccessScope, String& requestToken) in C:\Users\user\Desktop\DotNetOpenAuth-3.4.6.10357\Samples\DotNetOpenAuth.ApplicationBlock\GoogleConsumer.cs:line 204
at DotNetOpenAuth.Samples.OAuthConsumerWpf.MainWindow.<beginAuthorizationButton_Click>b__3(DesktopConsumer consumer, String& requestToken) in C:\Users\user\Desktop\DotNetOpenAuth-3.4.6.10357\Samples\OAuthConsumerWpf\MainWindow.xaml.cs:line 92
at DotNetOpenAuth.Samples.OAuthConsumerWpf.Authorize.<>c__DisplayClass4.<.ctor>b__0(Object state) in C:\Users\user\Desktop\DotNetOpenAuth-3.4.6.10357\Samples\OAuthConsumerWpf\Authorize.xaml.cs:line 33
at System.Threading._ThreadPoolWaitCallback.WaitCallback_Context(Object state)
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
at System.Threading._ThreadPoolWaitCallback.PerformWaitCallbackInternal(_ThreadPoolWaitCallback tpWaitCallBack)
at System.Threading._ThreadPoolWaitCallback.PerformWaitCallback(Object state)
InnerException: System.Net.WebException
Message=The remote server returned an error: (400) Bad Request.
Source=System
StackTrace:
at System.Net.HttpWebRequest.GetResponse()
at DotNetOpenAuth.Messaging.StandardWebRequestHandler.GetResponse(HttpWebRequest request, DirectWebRequestOptions options) in c:\Users\andarno\git\dotnetopenid\src\DotNetOpenAuth\Messaging\StandardWebRequestHandler.cs:line 126
InnerException:

Works for me. Perhaps your computer is behind a firewall or needs a proxy server registered?