What is the authentication protocol used by SSTP? Is it done at HTTPS layer or PPP layer?
Client is not authenticated to server at the HTTPS layer. SSTP client is authenticated to server at the PPP layer. So various PPP authentication algorithm (like MSCHAPv2, EAP-MSCHAPv2, EAP-Smart-card, PEAP) can be used with SSTP. For further details, refer to http://blogs.technet.com/rrasblog/archive/2007/01/10/how-sstp-based-vpn-connection-works.
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