L2TP uses the UDP Port 1701 for configuration, the UDP Port 500 for key exchange, and the UDP Port 4500 for NAT. Safest Protocol Due to highest level encryption …

Port(s) Protocol Service Details Source; 1701 : tcp: vpn: L2TP VPN (Virtual Private Networking) See also: port 500/udp (IPSec IKE) port 1723/tcp (PPTP) Unknown vulnerability in the HSQLDB component in JBoss 3.2.1 and 3.0.8 on Java 1.4.x platforms, when running in the default configuration, allows remote attackers to conduct unauthorized activities and possibly execute arbitrary code via Synology L2TP/IPSec VPN – rebelpeon.com Nov 25, 2013 VPN — IPsec — L2TP/IPsec | pfSense Documentation L2TP/IPsec¶ L2TP/IPsec is a common VPN type that wraps L2TP, an insecure tunneling protocol, inside a secure channel built using transport mode IPsec. L2TP/IPsec is supported starting with pfSense® software version 2.2-RELEASE. This article will explain how to configure the service and setup clients. L2TP Port Forwarding - NETGEAR Communities

L2TP over IPSec. To allow Internet Key Exchange (IKE), open UDP 500. To allow IPSec Network Address Translation (NAT-T) open UDP 5500. To allow L2TP traffic, open UDP 1701. Learn more: Enabling a Windows Firewall Exception for Port 445

L2TP uses the UDP Port 1701 for configuration, the UDP Port 500 for key exchange, and the UDP Port 4500 for NAT. Safest Protocol Due to highest level encryption … What port does VPN use? L2TP (Layer Two Tunneling Protocol) – This protocol uses port 1701 TCP, Port 500 UDP, and port 4500 UDP. IPSec (Internet Protocol Security) – This protocol uses port 500 UDP and ports 4500 UDP. SSTP (Secure Socket Tunneling Protocol) – This protocol uses port 443 TCP. OpenVPN – This protocol uses port 1194 TCP/UDP and p ort 443 TCP. How to Set Up VPN on Synology with L2TP | KeepSolid VPN

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Dec 24, 2012 Ports used for VPN Protocols – IPVanish The IPVanish software uses port 443; Both PPTP and L2TP need the PPTP & L2TP pass-through options in the firewall/router's management interface to be enabled (if applicable). Routers without these options may not support PPTP or L2TP traffic To allow PPTP traffic, open TCP port 1723; To allow L2TP w/ IPSec traffic, open UDP ports 500, 1701 & 4500