HTTPS Request From a Credential Provider DLL

I've been creating a Credential Provider DLL that authenticates via the internet before allowing login. However this hasn't worked as well as I expected because my WinHTTP request isn't getting sent. I've confirmed this using wire shark. but I can't figure out why it's not sending any requests off. I've checked that my code is actually calling the functions properly - and they are. But the http request never makes it off. I'm slightly confused at this point and I'm seeking to know i开发者_如何学运维f there is some blanket block against https Requests at login.

If you are using C++ CP-V2, so you can use easily from CPPRESTSDK library.

Note: You must note the DNS address and the digital certificate you are using must be valid.