How to Setup a VPN using SSTP on CentOS 6?
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The reasons you probably haven't seen much open-source development on this are:
- SSTP is a relatively new VPN protocol
- SSTP is a Microsoft-pushed technology
- OpenVPN already fulfills the particular needs for open-source solutions
If you want SSTP because firewalls already let through TCP port 443 traffic, OpenVPN already supports running a TCP-based server on any port, including 443. OpenVPN setups using TCP port 443 are quite common for this reason, although they're rightly not the recommended setup because running IP over TCP (especially TCP over TCP) generally gives poor performance.