The request was aborted: Could not create SSL/TLS secure channel .Net 4.5.2

Question

Please someone help me, when I invoke 3rd party webservice, it shows :

Initializing
Generating WSDL
System.InvalidOperationException: General Error https://xxx ---> System.Net.WebException: There was an error downloading 'https:/xxx'. ---> System.Net.WebException: The request was aborted: Could not create SSL/TLS secure channel.
   at System.Web.Services.Protocols.WebClientProtocol.GetWebResponse(WebRequest request)
   at System.Web.Services.Protocols.HttpWebClientProtocol.GetWebResponse(WebRequest request)
   at System.Web.Services.Discovery.DiscoveryClientProtocol.Download(String& url, String& contentType)
   --- End of inner exception stack trace ---
   at System.Web.Services.Discovery.DiscoveryClientProtocol.Download(String& url, String& contentType)
   at System.Web.Services.Discovery.DiscoveryClientProtocol.DiscoverAny(String url)
   at WebServiceStudio.Wsdl.ProcessRemoteUrls(DiscoveryClientProtocol client, StringCollection urls, XmlSchemas schemas, ServiceDescriptionCollection descriptions)
   --- End of inner exception stack trace ---
   at WebServiceStudio.Wsdl.ProcessRemoteUrls(DiscoveryClientProtocol client, StringCollection urls, XmlSchemas schemas, ServiceDescriptionCollection descriptions)
   at WebServiceStudio.Wsdl.Generate()

I Already try using X509 Certificate, give user everyone full permission.

Answer 1

This may occur when the SSL certificate of the web service is not valid.

For a workaround, try the following code:

System.Net.ServicePointManager.ServerCertificateValidationCallback += new System.Net.Security.RemoteCertificateValidationCallback(delegate
{
    return true;
});

If this fixes your issue, then you should check the certificate on your machine.

As @dman2306 says, this is merely to check whether the certificate is the cause of your issues. Do not use this in any production code.