Stack Exchange network consists of 177 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.
Q&A for work
Connect and share knowledge within a single location that is structured and easy to search.
SSTP is a VPN variant that enables PPP traffic on top of SSL/TLS. As it works on top of SSL/TLS it can be considered above OSI layer 4.
Are the questions about operation of SSTP VPN off topic on this site?