PPTP is known to be less secure than other VPN software, but if you need a quick solution for a VPN server that will connect out of the box from Windows workstations PPTP is the obvious choice.
Read it here
This post will show how easy it is to setup a pptp vnp server on Debian Etch.
A while ago setting up a pptp server was not so simple. It involved patching the kernel and the ppp daemon. These days in Debian Etch everything comes out of the box and we just have to install the pptpd server and configure it based on our needs.