OpenVPN redirect-gateway on Windows 7 Server

I occasionally connect to the internet using public wifi networks at coffee shops and the airport. I know they are not secure networks and I'd like to ensure that when I am on them all my traffic is routed through a secure connection.

I have a Windows 7 x64 machine which I'm trying to setup as an OpenVPN 2.1.3 server. I have successfully configured it and can establish a connection using the client on a different computer.

When connecting from the client I'd like to have all the traffic routed through the OpenVPN server. When I enable the push "redirect-gateway def1" option I can not connect to any sites using the client. The documentation states that if I am using Linux I'd need enable NAT using iptables -t nat -A POSTROUTING -s 10.8.0.0/24 -o eth0 -j MASQUERADE Unfortunately I'm not using Linux (though if I have to I'll set his up on a linux VM).

How do I configure OpenVPN and Windows so that the redirect-gateway works? Here is my OpenVPN Server config:

port 443
proto udp
dev tun

ca C:/PROGRA~2/OpenVPN/easy-rsa/keys/ca.crt
cert C:/PROGRA~2/OpenVPN/easy-rsa/keys/server.crt
key C:/PROGRA~2/OpenVPN/easy-rsa/keys/server.key  # This file should be kept secret

dh C:/PROGRA~2/OpenVPN/easy-rsa/keys/dh1024.pem

server 10.8.0.0 255.255.255.0

ifconfig-pool-persist ipp.txt

push "redirect-gateway def1"

push "dhcp-option DNS 10.8.0.1"

keepalive 10 120

comp-lzo

persist-key
persist-tun

status openvpn-status.log

verb 3

Thanks,

Martin