Getting a HttpStatusCode of 0

Question

Why am I getting a HttpStatusCode of 0 if I point the service my client is connecting to to a bad URL.

My statusCodeAsInt is showing up as a 0. Why is it not showing up as a 404 and being handled?

IRestResponse response = client.Execute(restReq); HttpStatusCode statusCode = response.StatusCode;  var statusCodeAsInt = (int) statusCode;          if (statusCodeAsInt >= 500)         {             throw new InvalidOperationException("A server error occurred: " + response.ErrorMessage, response.ErrorException);         }         if (statusCodeAsInt >= 400)         {             throw new InvalidOperationException("Request could not be understood by the server: " + response.ErrorMessage,                 response.ErrorException);         } 

What is the proper way to handle this RestResponse?

Answer 1

In my case it was not a firewall issue causing the StatusCode of 0. We were using a legacy app that was still using TLS 1.0 on a server that had blocked TLS 1.0 connections. Once we enabled TLS 1.2, we got the status codes we were expecting.

System.Net.ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12;