PPTP, L2TP and OpenVPN are VPN protocols used to establish a fast, secure & reliable connection between two nodes. Find out the difference between them. Sep 17, 2009  · PPTP is TCP port 1723. This is the port used to establish a PPTP connection. Data travelling through the Internet from a PPTP VPN client is encrypted and encapsulated. The entire data packet is encrypted. A new header is then attached with…