{{distinguish|Simple Symmetric Transport Protocol}}
'''Secure Socket Tunneling Protocol''' ('''SSTP''') is a form of [[Virtualvirtual private network|VPN]] (VPN) tunnel that provides a mechanism to transport [[Point-to-Point Protocol|PPP]] traffic through an [[Transport Layer Security|SSL]]/[[Transport Layer Security|TLS]] channel. SSL/TLS provides transport-level security with key-negotiation, [[encryption]] and traffic integrity checking. The use of SSL/TLS over [[Transmission Control Protocol|TCP]] port 443 allows SSTP to pass through virtually all [[Firewallfirewall (computing)|firewalls]] and [[proxy server]]s except for authenticated web proxies.<ref>{{cite web
