Issue calling remote web service from visual web part

Working on a proof of concept to see if it is possible and running into an issue.

Backgroud

I have a simple web service (.asmx type) that returns a small subset of data.  The web service resides on a seperate web server that is SSL enabled and has require client certificates set.  I am trying to call this web service via a custom visual web part in SharePoint (which is also SSL enabled).  I have added the certificate chain of the SSL certificate from the web server that hosts the web service into the SharePoint certificate store (in Central Admin).  I am adding a client certificate to the webservice call via the following statement.

XmlNode myNode = null
X509Certificate2 cert = new x509Certificate2(CertPath, CertPass)
if (cert != null)
{
   WebServiceTest.Service myService = new WebServiceTest.Service ();
   myService.Url = "https://serverFQDN/webservicetest/service.asmx";
   myService.ClientCertificates.Add(cert);
   myNode = myService.DataTest();
   return myNode
}

The above code is in a try catch that returns the error message and stacktrace back to the screen.

I can use this same code and call the web service from a standard ASP.Net web application hosted on a web server or my local machine or a console application with no issues, however as soon as I try it from a SharePoint web part I get the message "The Request was Aborted. Could not create SSL/TLS secure channel".  I have tried with the client certificate stored on the file system in a location accessible by SharePoint service accounts and as an embedded resource in the dll.

Any input is appreciated.

Jeremy