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The request was aborted: Could not create SSL/TLS secure channel [Solved]

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codeling 1573 - 6555
@2019-04-14 12:39:53

The following exception is thrown when trying to download a file using the following statement from a https url in my ASP.NET web application:

The request was aborted: Could not create SSL/TLS secure channel.
   at System.Net.WebClient.DownloadDataInternal(Uri address, WebRequest& request)
   at System.Net.WebClient.DownloadData(Uri address)
   at Canaware.Forum.Pages.ForumPage.UpdateMesasgeResources(HtmlDocument htmlDocument, Int64 messageId)
   at Canaware.Forum.Pages.postmessage.PostReply_Click(Object sender, EventArgs e)
   at System.Web.UI.WebControls.Button.OnClick(EventArgs e)
   at System.Web.UI.WebControls.Button.RaisePostBackEvent(String eventArgument)
   at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
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@2019-04-14 12:42:19

Add the below code in web application's Global.asax Application_Start():

System.Net.ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12 | SecurityProtocolType.Tls11;

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