The underlying connection was closed: Could not establish secure channel for SSL/TLS Mensaje recibido inesperado

ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls;

When framework is 1.1 / Windows XP Bug

Test :

<%@ Page Language=”C#” Debug=”True” %>
<%@ Import Namespace=”System.Net”%>
<%

WebClient client = new WebClient();
ServicePointManager.SecurityProtocol =SecurityProtocolType.Tls; //Works

ServicePointManager.SecurityProtocol =SecurityProtocolType.Ssl3; // Doesnt work
byte[] data = client.DownloadData(“https://solucionfactible.com/ws/services/Timbrado?wsdl&#8221;);
Response.BinaryWrite(data);
%>

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