C# with web browser "no transport" error

See more:

C#

I have a C# project which has an embedded WebBrowser control.

The code loads a HTML form into that browser. After the HTML form is completed by a user, they press an OK button.

At that point some JavaScript is executed, which finally passes control to a HTTPS site.

At that time, I receive an error "No Transport".

If however, I run the HTML straight into IE, it works.

Roughly, the java script looks like

$.post("https://somesite/DoSomething/?callback=?", { param1: x})
.done(function (x) {

$('input[id=txtValue]').val(x.Message);

return;
})
.fail(function (jqXHR,textStatus,errorThrown) {
alert(errorThrown);
});

How can I get past the error?

Thanks

What I have tried:

I am assuming it is because of Cross Site Scripting, so I tried setting CORS = true in the java script but no success.