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SSTP. Secure Socket Tunneling Protocol (SSTP) is a new tunneling protocol that uses the HTTPS protocol over TCP port 443 to pass traffic through firewalls and Web proxies that might block PPTP and L2TP/IPsec traffic.
The pre-shared key is merely used for authentication, not for encryption! IPsec tunnels rely on the ISAKMP/IKE protocols to exchange the keys for encryption, etc. But before IKE can work, both peers need to authenticate each other (mutual authentication). This is the only part in which the PSKs are used (RFC 2409).