SignalR 2.0 error /signalr/hubs 404 (Not Found) when using IIS

Question

I'm having some issues with SignalR 2.0 in EPiServer 7.5 (a MVC4 framework). All I get is a 404 error

GET http://web.com/signalr/hubs 404 (Not Found)

I'm hosting everything on a Windows 2012 R2 Server. Also noteworthy is that the solution works when running everything in IIS Express from Visual Studio but not in IIS 8.5.

What I've done so far is to add the SingalR references.

• Microsoft.AspNet.SignalR.Client, 2.0.0.0
• Microsoft.AspNet.SignalR.Core, 2.0.0.0
• Microsoft.AspNet.SignalR.System.Web, 2.0.0.0
• Microsoft.OWin, 2.1.0.0
• Microsoft.OWin.Host.SystemWeb, 2.1.0.0
• Microsoft.Owin.Security, 2.0.0.0
• Owin, 1.0.0.0

Startup.cs

The startup is intitialized on application start so that seems to work.

[assembly: OwinStartup(typeof(Web.Startup))]
namespace Web
{
    public class Startup
    {
        #region Local variables

        private static readonly ILog Logger = LogManager.GetLogger(System.Reflection.MethodBase.GetCurrentMethod().DeclaringType);

        #endregion

        #region Methods

        /// <summary>
        /// Configure SignalR
        /// </summary>
        /// <param name="app"></param>
        public void Configuration(IAppBuilder app)
        {
            try
            {
                Logger.MethodCallEntry();

                // Any connection or hub wire up and configuration should go here
                //app.MapSignalR(); // Doesn't work either
                var hubConfiguration = new HubConfiguration
                {
                    EnableDetailedErrors = true,
                    EnableJavaScriptProxies = false
                };

                app.MapSignalR("/signalr", hubConfiguration);
            }
            catch (Exception ex)
            {
                Logger.Error("Failed to initialize or map SignalR", ex);
            }
            finally
            {
                Logger.MethodCallExit();
            }
        }

        #endregion
    }
}

Script inclusion

<script src="/Static/Frameworks/Scripts/jquery-1.10.2.js"></script>
<script src="/Static/Frameworks/Scripts/knockout-3.0.0.js"></script>
<script src="/Static/Frameworks/Scripts/modernizr.2.7.0.js"></script>
<script src="/Static/Frameworks/Scripts/jquery.signalR-2.0.1.js"></script>
<!-- also tried path ~/signalr/hubs -->
<script src="/signalr/hubs"></script>

This is not a solution updated from 1.x SignalR!

Answer 1

The error was the exact same as in this post http://blogs.msdn.com/b/praburaj/archive/2013/12/02/owin-startup-class-not-detected.aspx

The solution was to totally empty the asp.net cache

Run this in PowerShell

net stop w3svc
Remove-Item -Path "C:\Windows\Microsoft.NET\Framework64\v4.0.30319\Temporary ASP.NET Files\root\*" -Force -Recurse
Remove-Item -Path "C:\Windows\Microsoft.NET\Framework\v4.0.30319\Temporary ASP.NET Files\root\*" -Force -Recurse
net start w3svc