Signalr using Redis backplane not propagating message

Question

I have a .net 4.5 MVC app which I have recently moved over to AWS, so we need to add a backplane to our Signalr implementation. I have followed the steps outlined at https://docs.microsoft.com/en-us/aspnet/signalr/overview/performance/scaleout-with-redis. I have installed the nuget package and my current configuration looks like this:

[assembly: OwinStartup(typeof(SignalrBootstrapper))]
namespace app
{
    public class SignalrBootstrapper
    {
        public void Configuration(IAppBuilder app)
        {
            var scaleoutConfig = new RedisScaleoutConfiguration(ConnectionStrings.Redis, "appSignalrBackplane");
            GlobalHost.DependencyResolver.UseStackExchangeRedis(scaleoutConfig);

            // Any connection or hub wire up and configuration should go here
            app.MapSignalR();
        }
    }
}

However, it doesn't seem to be working. Push notifications are no longer sent at all, and I tried manually subscribing to the channel using redis-cli and nothing is being published. There are no errors and I have tried manually entering the connection details into the UseStackExhangeRedis function instead of using the RedisScaleoutConfiguration as in the demo linked, but it hasn't helped.

Anduril Anduril · Accepted Answer · 2020-04-22T14:08:39

In the end, I found a way to enable tracing in Signalr: https://docs.microsoft.com/en-us/aspnet/signalr/overview/testing-and-debugging/enabling-signalr-tracing

Using the tracing I found there was an error loading a dll Error connecting to Redis - System.InvalidOperationException: The assembly for System.Numerics.Vectors could not be loaded, so I added a redirect to the web.config and that fixed the issue

<dependentAssembly>
    <assemblyIdentity name="System.Numerics.Vectors" publicKeyToken="b03f5f7f11d50a3a" culture="neutral" />
    <bindingRedirect oldVersion="0.0.0.0-4.1.4.0" newVersion="4.1.4.0" />
</dependentAssembly>

Signalr using Redis backplane not propagating message

1 Answers