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L2TP VPN with ISA
Setting up a PPTP VPN using ISA is very simple. Take your knowledge of certificates and add that to your VPN configuration and the results is a more secure VPN using L2TP.

Securing Remote Administration Using Remote Desktop for Windows 2003 Server
Many system administrators use Remote Desktop Protocol (RDP for short, also known as Terminal Services) to remotely access their Windows servers. This is great if you need to get at your servers while on the road, at home or heaven forbid a vacation. The security of Remote Desktop can be made more secure by making a few simple configuration changes.

VPN Primer
A primer on how a VPN works and why you might want one.