'The underlying connection was closed: An unexpected error occurred on a send.' error

[ajitgoel]

I have downloaded the code and updated the private key in HomeController.cs and
the public key in Charge.cshtml. I am constantly getting a : 'The underlying connection was closed: An unexpected error occurred on a send.' error on the
var stripeCharge = chargeService.Create(myCharge);
line in private async Task ProcessPayment(StripeChargeModel model) method.

Any inputs on what I might be doing wrong?