http://support.microsoft.com/default.aspx?scid=kb;en-us;323415

http://www.tomsnetworking.com/2003/05/20/how_to_vpn_firewall/
http://www.grc.com/port_500.htm
http://theillustratednetwork.mvps.org/RemoteDesktop/RemoteDesktopSetupandTroubleshooting.html

http://www.chicagotech.net/vpnsetup.htm
http://labmice.techtarget.com/windows2003/Network/defaut.htm

http://articles.techrepublic.com.com/5100-1035_11-5814036.html client_pictures