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POFormsAuthentication.SetAuthCookie throwing NullReferenceException in async action
 

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  1. POFormsAuthentication.SetAuthCookie throwing NullReferenceException in async action
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    <p>I am finding that <code>FormsAuthentication.SetAuthCookie</code> is throwing a NullReferenceException - Object reference not set to an instance of an object inside an async action on an azure website.</p> <p>I found the following:</p> <p><a href="http://connect.microsoft.com/VisualStudio/feedback/details/743350/formsauthentication-setauthcookie-throws-nullreferenceexception-if-called-in-an-async-action-in-mvc4" rel="noreferrer">http://connect.microsoft.com/VisualStudio/feedback/details/743350/formsauthentication-setauthcookie-throws-nullreferenceexception-if-called-in-an-async-action-in-mvc4</a></p> <p>However I already have</p> <pre><code> &lt;appSettings&gt; &lt;add key="aspnet:UseTaskFriendlySynchronizationContext" value="true" /&gt; </code></pre> <p>set and my code works fine locally I only experience the problem when I deploy to azure. I am using Azure Websites (<a href="https://www.windowsazure.com/en-us/home/scenarios/web-sites/" rel="noreferrer">https://www.windowsazure.com/en-us/home/scenarios/web-sites/</a>), it was my understanding that this uses the web.config normally? I have also tried adding the appsetting through the Azure control panel</p> <p><img src="https://i.stack.imgur.com/mwbff.jpg" alt="enter image description here"></p> <p>And adding <code>.ConfigureAwait(false);</code> to my awaited method but have had no luck.</p> <p>The following code will throw the exception</p> <pre><code>public class TestController : Controller { public async Task&lt;ActionResult&gt; Index() { var httpResponse = await new HttpClient().GetAsync("http://www.google.com"); FormsAuthentication.SetAuthCookie("test", true); return View(); } } </code></pre> <p><strong>Anyone know how I can get this to work?</strong> </p> <p><strong>UPDATE:</strong> </p> <p>Stack Trace: </p> <pre><code>[NullReferenceException: Object reference not set to an instance of an object.] System.Threading.Tasks.&lt;&gt;c__DisplayClass1c.&lt;GetRethrowWithNoStackLossDelegate&gt;b__1b(Task task) +91 System.Threading.Tasks.TaskHelpersExtensions.ThrowIfFaulted(Task task) +15 System.Web.Mvc.Async.TaskAsyncActionDescriptor.EndExecute(IAsyncResult asyncResult) +77 System.Web.Mvc.Async.&lt;&gt;c__DisplayClass3f.&lt;BeginInvokeAsynchronousActionMethod&gt;b__3e(IAsyncResult asyncResult) +16 System.Web.Mvc.Async.WrappedAsyncResult`1.End() +50 System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeActionMethod(IAsyncResult asyncResult) +29 System.Web.Mvc.Async.&lt;&gt;c__DisplayClass39.&lt;BeginInvokeActionMethodWithFilters&gt;b__33() +59 System.Web.Mvc.Async.&lt;&gt;c__DisplayClass4f.&lt;InvokeActionMethodFilterAsynchronously&gt;b__49() +240 System.Web.Mvc.Async.&lt;&gt;c__DisplayClass37.&lt;BeginInvokeActionMethodWithFilters&gt;b__36(IAsyncResult asyncResult) +12 System.Web.Mvc.Async.WrappedAsyncResult`1.End() +50 System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeActionMethodWithFilters(IAsyncResult asyncResult) +31 System.Web.Mvc.Async.&lt;&gt;c__DisplayClass2a.&lt;BeginInvokeAction&gt;b__20() +23 System.Web.Mvc.Async.&lt;&gt;c__DisplayClass25.&lt;BeginInvokeAction&gt;b__22(IAsyncResult asyncResult) +128 System.Web.Mvc.Async.WrappedAsyncResult`1.End() +50 System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeAction(IAsyncResult asyncResult) +26 System.Web.Mvc.&lt;&gt;c__DisplayClass1d.&lt;BeginExecuteCore&gt;b__18(IAsyncResult asyncResult) +14 System.Web.Mvc.Async.&lt;&gt;c__DisplayClass4.&lt;MakeVoidDelegate&gt;b__3(IAsyncResult ar) +25 System.Web.Mvc.Async.WrappedAsyncResult`1.End() +55 System.Web.Mvc.Controller.EndExecuteCore(IAsyncResult asyncResult) +41 System.Web.Mvc.Async.&lt;&gt;c__DisplayClass4.&lt;MakeVoidDelegate&gt;b__3(IAsyncResult ar) +25 System.Web.Mvc.Async.WrappedAsyncResult`1.End() +55 System.Web.Mvc.Controller.EndExecute(IAsyncResult asyncResult) +28 System.Web.Mvc.Controller.System.Web.Mvc.Async.IAsyncController.EndExecute(IAsyncResult asyncResult) +10 System.Web.Mvc.&lt;&gt;c__DisplayClassb.&lt;BeginProcessRequest&gt;b__4(IAsyncResult asyncResult) +28 System.Web.Mvc.Async.&lt;&gt;c__DisplayClass4.&lt;MakeVoidDelegate&gt;b__3(IAsyncResult ar) +25 System.Web.Mvc.Async.WrappedAsyncResult`1.End() +55 System.Web.Mvc.&lt;&gt;c__DisplayClasse.&lt;EndProcessRequest&gt;b__d() +31 System.Web.Mvc.SecurityUtil.&lt;GetCallInAppTrustThunk&gt;b__0(Action f) +7 System.Web.Mvc.SecurityUtil.ProcessInApplicationTrust(Action action) +23 System.Web.Mvc.MvcHandler.EndProcessRequest(IAsyncResult asyncResult) +59 System.Web.Mvc.MvcHandler.System.Web.IHttpAsyncHandler.EndProcessRequest(IAsyncResult result) +9 System.Web.CallHandlerExecutionStep.OnAsyncHandlerCompletion(IAsyncResult ar) +96 </code></pre> <p><strong>UPDATE</strong></p> <p>I found it works if setting the Cookie manually </p> <pre><code>FormsAuthenticationTicket ticket = new FormsAuthenticationTicket(1, "test", DateTime.Now, DateTime.Now.AddMinutes(30), true, null, FormsAuthentication.FormsCookiePath); string encTicket = FormsAuthentication.Encrypt(ticket); Response.Cookies.Add(new HttpCookie(FormsAuthentication.FormsCookieName, encTicket)); </code></pre> <p>I'm not going to answer the question though as would like to know why <code>FormsAuthentication.SetAuthCookie</code> is throwing the exception and why it is behaving differently on Azure Websites</p>
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    2. COAre you sure web sites currently support the unreleased ASP.NET 4.5?
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