The request was aborted: could not create SSL/TLS secure channel

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I am able to call my service from postman but when i copy the code from code snippet which is provided by postman itself and trying to run from visual studio C# console application ( Framework 4.7.2) getting below exception.

The request was aborted: Could not create SSL/TLS secure channel.

Code is as below

ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12 | SecurityProtocolType.Tls11 | SecurityProtocolType.Tls;
            ServicePointManager.SecurityProtocol = SecurityProtocolType.Ssl3;

            var client = new RestClient("https://XXX.XX.COM/token");
            var request = new RestRequest(Method.POST);
            request.AddHeader("Postman-Token", "XXXXX");
            request.AddHeader("cache-control", "no-cache");
            request.AddHeader("Content-Type", "application/json");
            request.AddParameter("undefined", "{\r\n    \"client_id\":\"XXXX\",\r\n    \"userid\":\"XXXX\",\r\n    \"password\":\"XXXX\"\r\n}\r\n", ParameterType.RequestBody);
            IRestResponse response = client.Execute(request);

What I have tried:

I have tried by adding below code but still its giving me same error.

ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12 | SecurityProtocolType.Tls11 | SecurityProtocolType.Tls;
           ServicePointManager.SecurityProtocol = SecurityProtocolType.Ssl3;

Posted 29-Dec-20 6:05am

vishal_h

Updated 4-Feb-21 17:56pm

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Sandeep Mewara 29-Dec-20 13:12pm

See if oyu have problem similar to this: [Solved] could not create SSL/TLS secure channel[^]

2 solutions

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RickZeeland · Answer 1 · 2020-12-29T07:30:00

You are setting ServicePointManager.SecurityProtocol twice, try removing the line:

ServicePointManager.SecurityProtocol = SecurityProtocolType.Ssl3;

You can also try setting this first:

ServicePointManager.Expect100Continue = true;

Otherwise try the steps here: cannot-connect-to-a-server-by-using-the-servicepointmanager-or-sslstre[^]

Btw. using the ServicePointManager Class[^] is not recommended anymore:

Quote:
We don't recommend that you use the ServicePointManager class for new development. Instead, use the System.Net.Http.HttpClient class.

vishal_h · Answer 2 · 2021-02-04T17:56:00

Solution 2

We have resolved this issue as there was cipher mismatch between windows server 2012 R2 and Linux server while communication.

Posted 4-Feb-21 17:56pm

vishal_h

Comments

Harold N Bright 16-Jul-21 5:33am

Hi vishal_h- how were you able to solve it? Even i came to the conclusion that the cypher difference is there, however i am not aware on how to solve it.