May 13, 2019

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. How to Allow VPN through Windows Firewall (2017 Jun 20, 2017 How to Configure IPSec on Windows May 13, 2019

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Service overview and network port requirements for Windows May 27, 2020