Could not establish secure channel for SSL/TLS with authority from IIS

Question

We are using third party web service to send SMS. Web service does not require any certificate and if i enter service address in browser i get below output. As the output its confirmed that we do not need any certificate to call this service.

The service is working fine if i call it from my development machine using visual studio but from IIS im getting error

Could not establish secure channel for SSL/TLS with authority.

Answer 1

Try to add this line in your code!

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