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PPTP (Point-to-Point Tunneling Protocol), a VPN solution built into Windows.It is an implementation of PPP over TCP. This means that a user must already have an Internet connection. The technology creates a second virtual PPP network adapter. By using the native PPP authentication and encryption services, the technology is easily implemented using existing technology.
Originally developed by Microsoft, U.S. Robotics (now 3Com), Ascend and other remote access companies.
In 1998, a severe flaw was found in PPTP's authentication scheme. This was fixed in MS-CHAP V2 of Microsoft's implementation.
When setting up a PPTP server, you must enable port 1723 and protocol 47 through the firewall.
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