We've started using the ASP.NET recaptcha control and it works fine. but one of the requirements we have is that all outbound traffic goes over Https.

I know that recaptcha supports https, but It's not clear how to configure (or even if it is configurable) when using the ASP.NET plugin option.

has anyone got any experience of this?

I'll expand a little on what I've found so far....

The Recaptcha package contains 3 public classes

RecaptchaControl, RecaptchaValidator and RecaptchaResponse

RecaptchaControl is an Asp.NET control, the recaptcha specific methods on there seem to be concerning themes/look and feel.

An instance of the Validator has a RemoteIP field (which I presume would represent the verification server), but I can't a way of binding that to the control.

RecaptchaResponse seems to more or less represent an enum with possible responses (valid/invalid/failed to connect).