Using gRPC in cTrader doesn't work

Hello cTrader Community,

currently I'm playing around with the cAlgo API. Inside the cTrader everythings working fine, but my new project consists of two components. One cTrader Bot and a second application with a selfmade GUI (without graphs). I tried the simplest gRPC sample (Greetings) I could found, but even with this example the communication out of the cTrader isn't possible. Outside the cTrader the example works out of the box.

cTrader Clientside:

        [Parameter(DefaultValue = "Hello world!")]
        Handler messageHandler;
        protected override void OnStart()
        {
            // To learn more about cTrader Automate visit our Help Center:
            // https://help.ctrader.com/ctrader-automate
            Print("start");
            using var channel = GrpcChannel.ForAddress("http://localhost:5001");
            var client = new Greeter.GreeterClient(channel);
            Task.Run(async () => await client.SayHelloAsync(new HelloRequest { Name =         "GreeterClient" }));

            Print("Shutting down");
        }

The server side is just like in the example: https://github.com/grpc/grpc-dotnet/tree/master/examples/Greeter ("I just changed it to http")

Is there any restrictions oder any reason why this or any kind of communication doesn't work?

EDIT: 

In the meantime I tried several ways to implement it, be it pipes, TCP sockets and several different libraries. Nothing seems to work although I have included all libraries

I appreciate any advice you can give me.

Best regards

Jonas