SignalR Unexpected response code: 500
You'll want to enable detailed errors for server which are off by default. I enable them in debug mode only
[assembly: OwinStartup(typeof(Startup))]namespace MvcProject.App_Start{ public class Startup { public void Configuration(IAppBuilder app) { var hubConfiguration = new HubConfiguration();#if DEBUG hubConfiguration.EnableDetailedErrors = true;#endif app.MapSignalR(hubConfiguration);Then the error should be pretty self explanatory after that.
Also check that you have a version of JSON.net that fixes this bug:JsonSerializer does not appear to respect TypeNameHandling property correctly