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.NET Could not create SSL/TLS secure channel with


.NET Could not create SSL/TLS secure channel with



I have get an email that It says, before 31 may I have to change to TLS 1.2 y http/1.1. My project is made with C# .NET and I have upgraded to 4.5 .NET version. Then I have updated my web service from paypal Then I have added this line to the project, before the web request:

ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12;


But when I call ClientePayPal.SetExpressCheckout(ref HeaderType, req)

It sayes this message "Could not create SSL/TLS secure channel  with"

Anybody know why? What I have to make? 

I have verified in my machine .Net and TLS1.2 and It returns always:



So, any help?


Thank you,