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A VPN port is a networking port that is used within a VPN infrastructure. They are the logical ports that enable VPN traffic to pass in and out of a VPN client or server device.
The number and type of VPN ports utilized depends on the protocol used. For example, the PPTP protocol uses TCP port number 1723 to create a connection to IP port 47 Generic Routing Encapsulation (GRE) for packet encapsulation. Similarly, IPSec-based VPN that provides a higher level of security utilizes several ports for security, such as IP port numbers 50 and 51 for Encapsulated Security Protocol (ESP) and Authentication Header (AH), respectively. It also utilizes UDP port 500 and 4500 for phase 1 and 2 negotiations.