"3.Application Code Changes
If you are calling the Reporting Services from your custom application. Then you need to make sure that in your application you are sending the communication over TLS 1.2
Applications that are using ServicePointManager-based APIs can set the protocol using as follows:
Net.ServicePointManager.SecurityProtocol = SecurityProtocolTypeExtensions.Tls12;
Applications that are using the SslStream AuthenticateAsClient(String, X509CertificateCollection, SslProtocols, Boolean) overload can set the SslProtocols value as Tls12."