Server stack trace: Microsoft.AspNet.SignalR.PersistentConnection.GetConnectionId(HostContext context, String connectionToken) Microsoft.AspNet.SignalR.PersistentConnection.ProcessRequest(HostContext context) Microsoft.AspNet.SignalR.Hubs.HubDispatcher.ProcessRequest(HostContext context) Microsoft.AspNet.SignalR.Owin.CallHandler.Invoke(IDictionary`2 environment) Microsoft.AspNet.SignalR.Owin.Handlers.HubDispatcherHandler.Invoke(IDictionary`2 environment) Microsoft.Owin.Host.SystemWeb.OwinCallContext.Execute() Microsoft.Owin.Host.SystemWeb.OwinHttpHandler.BeginProcessRequest(HttpContextBase httpContext, AsyncCallback callback, Object extraData) Exception rethrown at [0]: Microsoft.Owin.Host.SystemWeb.Infrastructure.ErrorState.<>c__DisplayClass1.b__0(Exception ex) Microsoft.Owin.Host.SystemWeb.Infrastructure.ErrorState.Rethrow() Microsoft.Owin.Host.SystemWeb.CallContextAsyncResult.End(IAsyncResult result) Microsoft.Owin.Host.SystemWeb.OwinHttpHandler.EndProcessRequest(IAsyncResult result) System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)