Asp.net – You don't have permission to access this site on this server

I have no trouble accessing the https://api.weather.gov/ API using Postman. But when I write simple .NET C# console app using Visual Studio 2017 using the suggested code snippet from Postman, I get this error. I am running both Postman and Visual Studio on a corporate VDI. How can I get it to work on Visual Studio? This is my code:

    class Program
    {
        static void Main()
        {
            RunAsync().GetAwaiter().GetResult();
        }

        static async Task RunAsync()
        {
            var client = new HttpClient();
            var request = new HttpRequestMessage(HttpMethod.Get, "https://api.weather.gov/gridpoints/IND/59,75/forecast");

            try
            {
                var response = await client.SendAsync(request);
                var statusCode = response.StatusCode.ToString();
                //response.EnsureSuccessStatusCode();
                Console.WriteLine(await response.Content.ReadAsStringAsync());
                Console.WriteLine($"Status code = ", statusCode);
            }
            catch (Exception e)
            {
                Console.WriteLine(e.Message);
            }
            Console.ReadLine();
        }