SignalR /signalr/hubs 404 Not Found

Question

I am trying to deploy a SignalR site on IIS. Code all works fine in VS. But getting the 404 not found error trying to resolve signalr/hubs so far I have tried.

1) Changing the Script ref to:

script src="<%= ResolveUrl("~/signalr/hubs") %>" type="text/javascript"></script>

2) Modifying Web.Config to include :

<system.webServer>
    <validation validateIntegratedModeConfiguration="false" />
    <modules runAllManagedModulesForAllRequests="true">
    </modules>
</system.webServer>

3) Changing the invoke requests on IIS for UrlMappingsModule.

4) added SignalR.Hosting.AspNet.dll to see if that would help anything.

Not sure what else to try or check, any help or point in the right direction?

Solution 1

Try adding a wildcard application map to your server to help map the unknown extension in the script URL "~/signalr/hubs"

Solution 2

The order of route registration matters. I had this exact problem and fixed it by ensuring my global.asax.cs looked like this:

public class MvcApplication : System.Web.HttpApplication
{
    protected void Application_Start()
    {
        AreaRegistration.RegisterAllAreas();
        RouteTable.Routes.MapHubs();

        WebApiConfig.Register(GlobalConfiguration.Configuration);
        FilterConfig.RegisterGlobalFilters(GlobalFilters.Filters);
        RouteConfig.RegisterRoutes(RouteTable.Routes);
    }
}

This was in a web site using SignalR, MVC and WebApi all together.

Solution 3

The reason of this 404 error is hubs are not mapped, previously it would have to be done as answered by SimonF. If you are using SignalR version 2 RouteTable.Routes.MapHubs(); is now obsolete. For mapping hubs you can create a startup class as below.

[assembly: OwinStartup(typeof(WebApplication1.Startup))]
namespace WebApplication1
{
    public class Startup
    {
        public void Configuration(IAppBuilder app)
        {
            // Any connection or hub wire up and configuration should go here
            app.MapSignalR();
        }
    }
}

referenace : http://www.asp.net/signalr/overview/releases/upgrading-signalr-1x-projects-to-20

Solution 4

If you are working on webforms, Please take the following steps

1. In the webconfig:

   <validation validateIntegratedModeConfiguration="false" />
   <modules runAllManagedModulesForAllRequests="true"/>
   

2. In the page add reference to hub as

   <script src="/signalr/signalr/hubs"></script>
   

   instead of

   <script src="/signalr/hubs"></script>
   

Solution 5

I was able to fix the 404 on ~/signalr/hubs by changing the following appSetting in web.config to "true".

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

View more solutions

Comments

[cbp]

Further info under the heading "404 not found error" here: asp.net/signalr/overview/troubleshooting-and-debugging/…

[shalke]

<script src="/signalr/signalr/hubs"></script> did work for me

[John]

Note - Mapping hubs is no longer required in SignalR version 2.0 onwards: asp.net/signalr/overview/signalr-20/…

[John]

Further - mapping hubs is no longer required in signalr 2.0 onwards (and in fact generates an error): asp.net/signalr/overview/signalr-20/…

[nZeus]

Do you know how to remove the second /signalr ?

[aruno]

I think you are mistaken. There is no overload to Application_Start with IAppBuilder - I couldn't find in new ASP.NET version either

[Chaitanya Gadkari]

from which class have you inherited your global.asax public class MvcApplication : System.Web.HttpApplication, I had used MvcApplication class as this and it worked for me. I did not continue with it, I used OwinStartup so I will try this again and update you on Application_Start. But I can assure 1st definitely works.

[Chaitanya Gadkari]

@Simon_Weaver you are right,something is wrong. when i pass IAppBuilder in global.asax theres HTTP Error 403.14 - Forbidden error, it is going for directory browsing, I dont know why, there is no compile error. Edited the answer and removed second approach

[Master Yoda]

it works for me too! thanks so much Chridam. My problem was that the server was looking for the following "localhost/signalr/hubs" (determined using Chrome developer console). In reality the url is dynamic and so this would not pick up the js file needed.

[Simon Green]

Hi, could you elaborate on how to add a wildcard application map, what details I need to add where etc, please? I have these symptoms now and would like to try out this answer

[Su Llewellyn]

@chridam I don't know how to add a wildcard application map. Please tell us?

[Vishal]

While this didn't work for me, it did point me in the right direction. In my case, I was missing the 'app.MapSignalR();' statement in the Startup.Configuration(IAppBuilder app) method. So, thank you!

[mannyCalavera]

I have tried this: <script src="~/signalr/hubs"></script> but it did not work. What should i do? Can you guys help me please. @user685590 Can you update your answer with adding a wildcard application map to my server

[abhijat_saxena]

in my case - I was sending negotiate request to service1 and making sendNotification request from service2 - due to which the handshake was not happening properly, if you have multiple services, make sure you send negotiate request to all of them (as per the requirements) and add listeners to each one of them

[Hagai Wild]

First time the (almost) least voted answer was the right one, thank you :)