Thus far we've only spoken about implementing Virtual Private Networks using Point-To-Point Tunneling Protocol. While PPTP is a ok protocol for secure tunneling, at least in my experience it comes with a few gotchyas. Namely firewalls.
VPNs based on Secure Sockets Layer or SSL technologies are less encumbered by these restrictions. Certificates are already in the browsers and there is often no software to install. Secure, Easy, Versatile.
You can think of SSL VPNs as the Webmail of email. Rather than setting up a dedicated client like Outlook or Thunderbird to use POP3 or IMAP4 we'll be using our web browser to access an https site.
SSL Explorer is a web based SSL VPN server. The technology was acquired by Barracuda Networks. Project named
Download, Run, Next, next, next, install, next, Create certificate, Install Service, browse to https://server:28080 from client, Login as admin and follow the certificate creation wizard.
System Configuration is basically the same on Linux or Windows.