How does the VPN client connect to the Cloud? (ports & protocols)

The VPN client is a lightweight application, running in the background on your computer, that enables you to make a secure VPN connection to your devices from within your browser. It uses outgoing port(s) to establish its connection.

Overview

Below is an overview of the ports and protocols that the VPN client utilizes, which can be blocked by the company’s firewall.

Direction Port Transport
protocols
Application
protocols
Outbound 443 TCP HTTPS, OpenVPN
Outbound 8443(1) TCP HTTPS

(1) Only used when stealth mode is activated for connectivity via a censored internet connection (e.g. when located in China).

The following local ports and protocols are also used, which can be blocked by the computer’s firewall.

Direction Port Transport
protocols
Application
protocols
Outbound 443 TCP HTTPS, OpenVPN
Outbound 8443(1) TCP HTTPS
Inbound (from localhost) 9250  TCP HTTPS, WebSocket
Inbound (from localhost) 9251(2) TCP OpenVPN Management Interface
Inbound (from localhost) 9255(1) TCP HTTPS

(1) Only used when stealth mode is activated for connectivity via a censored internet connection (e.g. when located in China).
(2) Only for Windows.

 

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