Secure Socket Tunneling Protocol (SSTP)
- is a form of virtual private network (VPN) tunnel that provides a mechanism to transport PPP traffic through an TLS channel
- SSL/TLS provides transport-level security with key-negotiation, encryption and traffic integrity checking
- the use of SSL/TLS over TCP port 443 allows SSTP to pass through virtually all firewalls and proxy servers except for authenticated web proxies
- developed by Microsoft