RestSharp: Could not create ssl/tls secure channel

Expected Behavior

Successful response from server with the collection of data expected without the need of adding any certificate

Actual Behavior

error message: Could not create ssl/tls secure channel

Steps to Reproduce the Problem

Execute the following code

  var client = new RestClient("https://url/api");
            var credential = new HawkCredential
            {
                Id = "id",
                Algorithm = "sha256",
                Key = "key"
            };
            client.Authenticator = new HawkNetAuthenticator(credential);
            var request = new RestRequest("endpointapi/", Method.GET);
            System.Net.ServicePointManager.ServerCertificateValidationCallback = delegate { return true; };
            System.Net.ServicePointManager.SecurityProtocol = System.Net.SecurityProtocolType.Ssl3;
            
            IRestResponse response = client.Execute(request);

Also created the following class to do the custom Hawk Auth

public class HawkNetAuthenticator : IAuthenticator
    {
        private readonly HawkCredential _credential;

        public HawkNetAuthenticator(HawkCredential credential)
        {
            _credential = credential;
        }

        public void Authenticate(IRestClient client, IRestRequest request)
        {
            var uri = client.BuildUri(request);
            var portSuffix = uri.Port != 80 ? ":" + uri.Port : "";
            var host = uri.Host + portSuffix;
            var method = request.Method.ToString();

            var header = Hawk.GetAuthorizationHeader(host, method, uri, _credential);

            request.AddHeader("Authorization", "Hawk " + header);
        }

    }

Debug the call to the api

Specifications

Version: 105.2.3.0
Platform: .NET

StackTrace

Anulada la solicitud: No se puede crear un canal seguro SSL/TLS

Could not create ssl/tls secure channel

Hope you guys can help me with this

Best Regards

About this issue

Original URL
State: closed
Created 6 years ago
Comments: 16 (4 by maintainers)

Most upvoted comments

I found solation after more searching 😃

Replace https to http

zanyar3 on Oct 27, 2022

I ran into this today. We’re on .net 4.6.1 with RestSharp 106.6.3.0 and this is still an issue there. Adding the following line of code prior to my first request resolves the issue for me

ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12;

Here’s a configuration based solution (and some good commentary about the root cause) if you don’t want to or can’t add code: https://stackoverflow.com/questions/43872575/net-framework-4-6-1-not-defaulting-to-tls-1-2

Edit: After further research, there appears to be a recommended solution of setting the following in your web.config but that appears to not work for asp.net applications.

<configuration> <runtime> <AppContextSwitchOverrides value="Switch.System.Net.DontEnableSystemDefaultTlsVersions=false" /> </runtime> </configuration>

I also tried adding it as an AppSetting but that also failed. Back to hard-coding TLS 1.2

dankoster on Jan 4, 2019

It seems like an issue with your specific environment, where you have a proxy, which requires authentication. I cannot reproduce this because I haven’t seen places that use http proxy for years. I think you get more luck on StackOverflow.

alexeyzimarev on Jul 18, 2018

Thanks a lot for the feedback Henry @driekus77 , it’s nice to get some support when giving your first steps, unfortunately I had tried it already and have something like this

var client = new RestClient("https://URL/api");
HawkNet.HawkCredential credenciales = new HawkNet.HawkCredential();

credenciales.Algorithm = "sha256";
credenciales.Key = "Key";
credenciales.Id = "Id";

client.Authenticator = new HawkAuth(credenciales);
client.Proxy = System.Net.WebRequest.GetSystemWebProxy();
//client.Proxy.Credentials = (System.Net.NetworkCredential)System.Net.CredentialCache.DefaultCredentials;
var request = new RestRequest("endpoint/", Method.GET);

ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12;
IRestResponse response = client.Execute(request);

I’m usign: .NET -> 4.5.2 .Net Core -> Not installed (couldn’t find the folder)

ASPuma on Jun 12, 2018

Don’t know RestSharp that wel but maybe this code example will help?:

			var client = new RestClient("https://httpbin.org");
			var request = new RestRequest("/get", Method.GET);

			client.Proxy = WebRequest.DefaultWebProxy;  // <== Add this line in your code?

			IRestResponse result = client.Execute(request);

Googleing on this showed me that it makes a different which .NET Framework / Core / Standard you use. If you still have issues point out which one you use.

driekus77 on Jun 12, 2018

I had the same issue when downgrading to .NET 4.5 from version 4.6.2.

I went back to 4.6.2 and the problem solved!

driekus77 on Jun 11, 2018