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

Answer 2

just wanted to put my 2 cents in. I had this error, and it ended up being because i had

<add key="owin:AutomaticAppStartup" value="false" />

in my web.config. removing this line fixed everything up for me!

Answer 3

Just had the same 404 problem. Ended up I updated all the DLLs except for one which was problem. I didn't update Microsoft.AspNet.SignalR.SystemWeb.dll

Answer 4

My problem was resolved by removing nuget-package "Microsoft.Owin.Host.SystemWeb", which was referenced in packages.config with version="2.1.0" and installing version="3.0.1".

With this version the owin environment was never started on the iis8 on server 2012r2 with the error, that the namespace "Host" was not found.

Microsoft.Common.CurrentVersion.targets(1697,5): warning MSB3245: Could not resolve this reference. Could not locate the assembly "Microsoft.Owin.Host.SystemWeb, Version=3.0.1.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL". Check to make sure the assembly exists on disk.

Startup.cs(2,22): error CS0234: The type or namespace name 'Host' does not exist in the namespace 'Microsoft.Owin' (are you missing an assembly reference?) [*.csproj]

Answer 5

I just had a similar problem getting the "MoveShape" demo to work on a freshly built Win 2012R2 server. I resolved the problem by adding the role/features: "Web Server (IIS)" -> "Application Development" and selecting ".NET Extensibility 4.5", "ASP.NET 4.5", "ISAPI Extensions", "ISAPI Filters" and "WebSocket Protocol".

Once I restarted the system or IIS, the demo starting working.