C# SDK LogOnAsyc fail!!

[sspeng1209]

When I use c# 2.0 SDK calll service.LogOnAsync function, I receive the following message:
Message: The underlying connection was closed: The connection was closed unexpectedly.

How to solve it?

Code:
static async Task async1()
{
try
{
// Create a Service instance
var service = new Service(new Uri("http://localhost:8089"));
await service.LogOnAsync("admin", "test1234");
........................
}
catch(Exception err)
{
Console.WriteLine("Message=",err.Message);
}
}

    static void Main(string[] args)
    {           
        Task.Run(()=> async1());
        Console.ReadKey();            
    }

[jkat54]

You should be using https://localhost:8089 not http

This is the Splunk Daemons rest API port and it’s SSL by default (https).

[sspeng1209]

I try it using https://localhost:8089.But i receive the message:
The underlying connection is down: A trust relationship cannot be established for the SSL/TLS secure channel.