Routing and permissions on Windows

In this recipe, we will focus on the common error experienced by the users when the VPN client machine is running Windows without full privileges. Under certain circumstances, the OpenVPN client can connect successfully but the routes that are pushed out by the remote server are not correctly set up. This recipe will focus on how to troubleshoot and correct this error. This misconfiguration applies mostly to Windows XP and Windows 2003, as on Windows Vista/7 other privilege problems may occur.

Getting ready

Install OpenVPN 2.0 or higher on two computers. Make sure the computers are connected over a network. Make sure the server has two separate network connections to a router or to the Internet. Set up the client and server certificates using the first recipe from Chapter 2, Client-server IP-only Networks. For this recipe, the server computer was running CentOS 5 Linux and OpenVPN 2.1.1. Keep the configuration file basic-udp-server.conf from the Chapter 2...