Below you will find detailed information on ports used for VPN pass through.

If RRAS based VPN server is behind a firewall (i.e. a firewall is placed between Internet and RRAS server), then following ports need to be opened (bidirectional) on this firewall to allow VPN traffic to pass through: -

For PPTP: IP Protocol=TCP, TCP Port number=1723   IP Protocol=GRE (value 47)   For L2TP: IP Protocol Type=UDP, UDP Port Number=500    IP Protocol Type=UDP, UDP Port Number=4500   IP Protocol Type=ESP (value 50)   For SSTP: IP Protocol=TCP, TCP Port number=443   For IKEv2: IP Protocol Type=UDP, UDP Port Number=500    IP Protocol Type=UDP, UDP Port Number=4500   IP Protocol Type=ESP (value 50)   If RRAS server is directly connected to Internet, then you need to protect RRAS server from the Internet side (i.e. only allow access...

In this scenario I will take you through the simple process of joining a Windows PC or Windows Server 2008 R2 in Site B to an existing Forest / Domain controller in Site A over an established router-to-router IPsec VPN connection.

This guide will take you through setting up a VPN Connection in Windows XP step by step. Keep in mind that you will need to have your own VPN credentials - this is usually provided by your Systems Administrator or I.T Manager. Read on to discover how easy it is...

A Virtual Private Network Connection otherwise known as a VPN connection is a secure and easy way to create a secure Point-to-Point connection in order to access domain specific network resources. Windows 7 comes pre-loaded with the ability to connect to a VPN gateway with encryption. Read on for a step by step guide in creating a VPN connection to an existing VPN Gateway.

Error 812 may be displayed when attempting to connect to a Windows VPN Server. This error indicates that the attempt to establish a VPN connection was rejected by the server. Read on for a simple fix.