IP-HTTPS secure sockets layer over port 443
A Secure Sockets Layer (SSL) channel is used by the Secure Sockets Tunneling Protocol (SSTP), a VPN protocol, to send PPTP or L2TP packets.
A virtual private network (VPN) tunnel called Secure Socket Tunneling Protocol (SSTP) offers a way to send PPP data over an SSL/TLS channel. By combining key negotiation, encryption, and traffic integrity checking, SSL/TLS offers transport-level security.
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